CN113872224A - Method for analyzing influence of energy storage on safety of regional comprehensive energy system - Google Patents
Method for analyzing influence of energy storage on safety of regional comprehensive energy system Download PDFInfo
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Abstract
The invention discloses a method for analyzing the influence of energy storage on the safety of a regional comprehensive energy system, which comprises the following steps: acquiring safety constraints of key equipment and key pipelines of the regional integrated energy system after the energy storage device is considered to be accessed based on the N-1 safety criterion of the regional integrated energy system; constructing a practical safety boundary of the regional comprehensive energy system considering the access of the energy storage device based on a practical safety domain method of the regional comprehensive energy system; constructing a system maximum energy supply capacity model correspondingly considering the energy storage device based on the safety boundary considering the energy storage device; based on the working point of the maximum energy supply capacity of the system, a two-dimensional or three-dimensional observation variable is selected, and the security domain of the regional comprehensive energy system before and after the energy storage device is considered to be accessed is subjected to dimensionality reduction observation, so that the change of the security before and after the energy storage device is accessed into the system can be quickly and accurately analyzed.
Description
Technical Field
The invention relates to the field of safety analysis of comprehensive energy systems, in particular to a method for analyzing the influence of energy storage on the safety of a regional comprehensive energy system.
Background
With the push and development of the energy internet, the integrated energy system as a carrier of the integrated energy system at the physical level becomes a research hotspot in recent years. The comprehensive energy system relates to multiple links of energy production, transmission, distribution, conversion, consumption and the like, breaks through independent planning, design and operation of an original single energy system, emphasizes the cross mutual fusion and diversified common development of multiple energy sources in different subject fields, and has important significance for realizing efficient, green and sustainable supply of energy sources. However, the structure of the multi-energy coupled integrated energy system is more complex, and local load fluctuation or element faults are transmitted to the whole multi-energy flow network through the coupling component. Therefore, the safety analysis of the integrated energy system is more complicated, and due to the mutual influence of multiple energy flows, the normally operating system may be in an unsafe state after a fault occurs in a certain element, and research on the safety analysis of the integrated energy system is urgently needed. And the energy storage device is taken as a target vigorously popularized in the fourteen-five period, and can be taken as a temporary power supply after the system key function equipment or the energy supply pipeline is in fault, so that the energy storage device has important significance for improving the safety of the comprehensive energy system N-1. However, at present, research on the safety change of N-1 after the energy storage is accessed into the comprehensive energy system is less, and a method for analyzing the influence of the energy storage on the safety of the regional comprehensive energy system N-1 is lacked.
The safety domain method of the regional integrated energy system expands the N-1 safety criterion in the electric power system to the regional integrated energy system, is mainly used for researching the safety state of the regional integrated energy system under a long time scale after a fault, and carries out steady-state modeling on the regional integrated energy system to analyze the static safety of the system after N-1. Compared with the traditional point-by-point method, the regional comprehensive energy system security domain method is high in solving speed, high in security evaluation efficiency and comprehensive in obtained security information, and is a very efficient security analysis method.
Therefore, it is necessary to obtain the safety constraints of the key equipment and the key pipeline of the regional integrated energy system after the energy storage device is accessed and consider the safety of the regional integrated energy system based on the safety criterion of the regional integrated energy system N-1, and construct the practical safety boundary of the regional integrated energy system considering the energy storage device access; based on the working point of the maximum energy supply capacity of the system, a two-dimensional or three-dimensional observation variable is selected, and the security domain of the regional comprehensive energy system before and after the energy storage device is considered to be accessed is subjected to dimensionality reduction observation, so that the change of the security before and after the energy storage device is accessed into the system can be quickly and accurately analyzed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for analyzing the influence of energy storage on the safety of a regional comprehensive energy system, which can quickly and effectively analyze the change of the safety of a system N-1 before and after an energy storage device is connected into the regional comprehensive energy system.
The purpose of the invention is realized by the following technical scheme:
a method for analyzing the influence of energy storage on the safety of a regional comprehensive energy system comprises the following steps:
based on the safety criterion of the regional comprehensive energy system N-1, taking the faults of the key equipment of the energy hub and the outlet of the key energy supply pipeline as an expected accident, acquiring the safety constraints of the key equipment and the key pipeline of the regional comprehensive energy system after the energy storage device is connected, and reasonably simplifying the voltage, air pressure and water pressure limiting nonlinear constraints by combining with the engineering practice;
constructing a practical safety boundary expression of the regional comprehensive energy system considering the access of the energy storage device based on the simplified practical safety domain method of the regional comprehensive energy system, and describing the safety condition of the regional comprehensive energy system N-1;
based on the safety boundary expression considering the energy storage device, the safety boundary expression is used as a constraint condition for optimizing and solving the maximum energy supply capacity, a system maximum energy supply capacity model correspondingly considering the energy storage device is constructed, and the maximum energy supply capacity working point of the regional comprehensive energy system is obtained through optimizing and solving;
selecting a two-dimensional or three-dimensional observation variable based on the solved maximum energy supply capacity working point of the regional comprehensive energy system, and performing dimension reduction observation on the security domains of the regional comprehensive energy system before and after the energy storage device is considered to be accessed;
by observing the security domain change condition of the regional comprehensive energy system before and after the energy storage device is accessed, the security change before and after the energy storage device is accessed to the regional comprehensive energy system is analyzed.
Further, acquiring and considering safety constraints of key equipment and key pipelines of the regional comprehensive energy system after the energy storage device is accessed, and reasonably simplifying the voltage, air pressure and water pressure limiting nonlinear constraints by combining engineering practice, specifically:
the safety constraint of the regional integrated energy system N-1 is obtained based on the N-1 safety criterion; assuming that the residual energy of the energy storage device is enough to support and finish the tape transferring time required by the regional comprehensive energy system, the safety constraint describes that the regional comprehensive energy system transfers the load through other energy supply equipment and the energy storage device under the condition of the most serious fault, so that the load is not lost after the fault; therefore, the safety constraint of the regional comprehensive energy system N-1 comprises equipment capacity constraint after belt transfer, pipeline transmission capacity constraint after belt transfer and voltage and air pressure operation parameter constraint; only taking the key equipment and key pipeline capacity constraint of the regional comprehensive energy system after the energy storage device is accessed as the safety constraint of the regional comprehensive energy system N-1;
only considering the maximum charging and discharging energy power of the energy storage device, the simplified model of the energy storage device is as follows:
CES＝Pc·ηc＝Pd·ηd
in the formula, CESThe method comprises the steps of representing the charge and discharge power of an energy storage device, namely the power capacity of stored energy, and hereinafter referred to as capacity for short; pc、PdRespectively representing the maximum charge and discharge power of stored energy; etac、ηdRespectively representing stored energyCharge-discharge efficiency conditions;
the key equipment of the regional comprehensive energy system comprises an energy storage device, a transformer, a CHP (chemical vapor deposition) device, a gas boiler, a circulating pump and a compressor; when the key equipment in the energy hub stops running due to faults, the load of a fault area is transferred to the interconnected key equipment; the safety constraint of the key equipment N-1 of the regional comprehensive energy system considering the access of the energy storage device is as follows:
in the formula (I), the compound is shown in the specification,
representing the load transferred from critical device i to device j due to a failure of device i or the pipeline connected thereto;
represents the original load provided by device j; cjRepresents the capacity of device j; k is an overload coefficient and takes the value of 1; cES.i、CES.jRespectively representing the discharge power of the energy storage systems connected to the devices i and j, and taking a negative value when charging; phijRepresents the critical group of pipes connected to j; l isxRepresents the load at which the pipeline x is energized;
the key pipeline is positioned at the outlet of the energy supply equipment; when one key pipeline stops running due to an N-1 accident, the load provided by the key pipeline is transferred to other interconnected key pipelines; the safety constraint of a key energy supply pipeline N-1 of the regional comprehensive energy system considering the access of the energy storage device is as follows:
in the formula (I), the compound is shown in the specification,
represents the load transferred from critical pipeline m to critical pipeline n due to a failure of m or the equipment connected thereto;
represents the original load of pipeline n; cnRepresents the rated capacity of the pipeline n; cES.mRepresenting the discharge power of the stored energy connected to m.
Further, the practical safety boundary expression of the regional integrated energy system considering the access of the energy storage device is as follows:
in the formula (I), the compound is shown in the specification,
represents the upper boundary of the m-pipe;
representing an additional constraint when n is a multi-energy coupling device;
representing the load transferred from critical device i to device j due to a failure of device i or the pipeline connected thereto;
represents the original load provided by device j; cjRepresents the capacity of device j; k is an overload coefficient and takes the value of 1; cES.i、CES.jRespectively representing the discharge power of the energy storage systems connected to the devices i and j, and taking a negative value when charging; cnRepresents the rated capacity of the pipeline n; cES.mDischarge representing stored energy connected to mPower;
in the formula (I), the compound is shown in the specification,
represents the lower boundary of the pipeline m; pE.mRepresents the power supplied by line m and consumed by the compressor or circulation pump, which is an additional constraint when m supplies energy to the compressor or circulation pump; wherein, the new state-CES.m≤L m0 or less represents a special condition where the stored energy is charged by another energy hub, where LmRepresenting the outlet load of the critical pipeline connected with the stored energy, at-C in view of the controllability of the charging and discharging state of the stored energyES.m≤LmThe working point less than or equal to 0 is safe.
Further, the maximum energy supply capacity model of the system considering the energy storage device is as follows:
in the formula, hP(L)＝0、hN(L)＝0、hH(L)＝0、hEH(L) ═ 0 represents the energy balance equation corresponding to the power system, natural gas system, thermodynamic system and energy hub; wmin≤W(L)≤WmaxThe method comprises the steps that an N-1 safety constraint inequality of a regional comprehensive energy system with the energy storage device connected is considered, and safety verification of key equipment and key pipelines in an energy hub is included;
the maximum energy supply capacity model of the regional comprehensive energy system with the energy storage device connected is taken as an optimization solving model, the optimization target is that the sum of the loads of the working points is maximum, and the constraint conditions are power balance constraint of each energy subsystem and N-1 safety constraint of the regional comprehensive energy system with the energy storage device connected.
Further, selecting a two-dimensional or three-dimensional observation variable, and performing dimensionality reduction observation on the security domains of the regional comprehensive energy system before and after the energy storage device is considered to be accessed specifically:
(1) solving the maximum energy supply capacity and load distribution; initializing parameters including a topological structure, equipment parameters and algorithm parameters; the method comprises the steps of taking the maximum energy supply capacity of the electric-thermal coupling comprehensive energy system as an optimization target, taking a practical safety domain model as a constraint condition, solving TSC working points of the electric-thermal coupling comprehensive energy system according to a flow calling original dual inner point method, and obtaining the TSC and the whole network load distribution when the TSC is achieved;
(2) obtaining a critical point array; selecting any one group of multi-energy pipeline outlet load combination Lb＝(Lm,Ln,Lo) Is a free variable, Lm,Ln,LoRespectively selecting three outlet load variables, and fixing the other variables as pipeline section loads when the TSC is distributed; order (L)m,Ln) Are limited to upper limits by step sizes DeltaL respectively
Approaching until reaching the upper limit of the working point, solving the L when the working point meets the multi-energy flow energy balance condition, and enabling the safety domain model to restrict the energy hub key equipment and the key pipeline outlet N-1 safety inequality to restrict the critical passing each timeoAnd load distribution, and setting the operating point Lb＝(Lm,Ln,Lo) Recording the data into a critical point array B;
(3) performing critical point array fitting; fitting the critical point array B by using a least square method to obtain a three-dimensional visual boundary of the security domain;
the step of selecting a two-dimensional observation variable to perform dimensionality reduction observation on the security domains of the regional comprehensive energy system before and after the energy storage device is considered to be accessed is the same as the three-dimensional principle.
Further, by observing the security domain change condition of the regional comprehensive energy system before and after the energy storage device is accessed, the analysis of the security change of the energy storage device before and after the energy storage device is accessed into the regional comprehensive energy system is specifically as follows:
based on dimension reduction observation of the security domain of the integrated energy system, quantitative description can be carried out on N-1 security influence after the energy storage access system by comparing area change of two-dimensional security domains, volume change condition of three-dimensional security domains and security domain expansion of the integrated energy system in front and at back of the integrated energy system with different capacities and different positions or not
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. compared with the existing regional comprehensive energy system security domain modeling method, the method considers the influence of the energy storage device access on the practical security boundary, the maximum energy supply capability model and the security domain after dimensionality reduction observation, and shows the influence of the energy storage access on the regional comprehensive energy system security from multiple dimensions.
2. The method based on the security domain can quickly and accurately analyze the influence of the security of the system N-1 after the energy storage access, and can acquire more visual and comprehensive security information based on the observation of the dimension-reduced security domain.
Drawings
FIG. 1 is a process of simulation fitting solving of a safety boundary of a comprehensive energy system considering energy storage;
FIG. 2 is an example topology of an integrated energy system that considers energy storage;
FIG. 3 illustrates a two-dimensional security domain in a non-energy-storage scenario;
FIG. 4 is a two-dimensional security domain in an energy storage scenario;
FIG. 5 is a three-dimensional security domain in a no energy storage scenario;
fig. 6 is a three-dimensional security domain in a stored energy scenario.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to effectively analyze the change of the safety of the system N-1 before and after the energy storage device is connected to the regional comprehensive energy system, the embodiment of the invention provides a method for analyzing the influence of energy storage on the safety of the regional comprehensive energy system, which is described in detail as follows:
101: based on the safety criterion of the regional comprehensive energy system N-1, taking the key equipment of the energy hub and the outlet of the key energy supply pipeline as an expected accident, acquiring the safety constraints of the key equipment and the key pipeline of the regional comprehensive energy system after the energy storage device is accessed, and reasonably simplifying the nonlinear constraints such as voltage limitation and the like by combining with the engineering practice;
102: constructing a practical safety boundary expression of the regional integrated energy system considering the access of the energy storage device based on a practical safety domain method of the regional integrated energy system, and describing the safety condition of the regional integrated energy system N-1;
103: constructing a system maximum energy supply capacity model correspondingly considering the energy storage device based on a safety boundary expression considering the energy storage device as a constraint condition for maximum energy supply capacity optimization solution;
104: selecting a two-dimensional or three-dimensional observation variable based on the solved maximum energy supply capacity working point of the regional comprehensive energy system, and performing dimension reduction observation on the security domains of the regional comprehensive energy system before and after the energy storage device is considered to be accessed;
105: by observing the security domain change conditions before and after the energy storage is accessed, the change of the security before and after the energy storage device is accessed into the regional comprehensive energy system is analyzed quickly and accurately.
The scheme of the above steps is further described with reference to fig. 1, calculation formulas, and examples, which are described in detail below:
with respect to step 101: based on the safety criterion of the regional comprehensive energy system N-1, taking the key equipment of the energy hub and the outlet of the key energy supply pipeline as an expected accident, acquiring the safety constraints of the key equipment and the key pipeline of the regional comprehensive energy system after the energy storage device is accessed, and reasonably simplifying the nonlinear constraints such as voltage limitation and the like by combining with the engineering practice;
and considering the safety domain of the regional comprehensive energy system for energy storage, taking an N-1 safety criterion as a reference, and constructing the safety domain of the regional comprehensive energy system for the regional comprehensive energy system taking an energy hub as a multi-energy network supply source based on a load power space formed by the outlet power of a pipeline section at the output side of the energy hub at a working point. For the safety domain of the electro-thermal coupling integrated energy system, the main concern is the charging and discharging capacity of the energy storage device in a short time, and the concern on the energy storage capacity of the energy storage device is less. The model of the energy storage device is therefore as follows:
CES＝Pc·ηc＝Pd·ηd (1)
in the formula, CESThe method comprises the steps of representing the charge and discharge power of an energy storage device, namely the power capacity of stored energy, and hereinafter referred to as capacity for short; pc、PdRespectively representing the maximum charge and discharge power of stored energy; etac、ηdRespectively showing the charge and discharge efficiency conditions of stored energy.
The key equipment of the regional integrated energy system of this example includes energy storage, transformer, CHP, gas boiler, circulation pump and compressor. When a critical device in the energy hub stops operating due to a fault, the load in the fault area will be transferred to the interconnected critical device. And the N-1 safety constraint is constructed according to the load transfer process and can be expressed as:
in the formula (I), the compound is shown in the specification,
representing the load transferred from critical device i to device j due to a failure of device i or the pipeline connected thereto;
represents the original load provided by device j; cjRepresents the capacity of device j; k is the overload factor, which is a value of 1 herein. CES.i、CES.jRepresents the discharge power of the energy storage system connected to the devices i, j, and takes a negative value when being charged; phijRepresents the critical group of pipes connected to j; l isxRepresenting the load at which the pipe x is energized.
The key pipeline is positioned at the outlet of the energy supply device. When one critical pipe is taken out of service due to an N-1 incident, the load it provides is transferred to the other interconnected critical pipes. Thus, the constraint can be expressed as:
in the formula (I), the compound is shown in the specification,
represents the load transferred from critical pipeline m to critical pipeline n due to a failure of m or the equipment connected thereto;
represents the original load of pipeline n; cnRepresents the rated capacity of the pipeline n; cES.mRepresenting the discharge power of the stored energy connected to m.
In the scene of the comprehensive energy system in the areas such as the actual industrial park, the pipeline length is short, and the out-of-limit probability of parameters such as voltage and air pressure is low, so that the inequality constraints of the running parameters such as the voltage constraint in the model can be simplified, and the practical safety domain model with higher solving speed is obtained.
With respect to step 102: constructing a practical safety boundary expression of the regional integrated energy system considering the access of the energy storage device based on a practical safety domain method of the regional integrated energy system, and describing the safety condition of the regional integrated energy system N-1;
through simplifying the operation parameters such as voltage constraint and the like in the model, the practical safety boundary of the electricity-thermal coupling comprehensive energy system considering the energy storage access can be expressed as follows:
in the formula (I), the compound is shown in the specification,
represents the upper boundary of the m-pipe;
representing n as an additional constraint when the multi-energy coupling device.
In the formula (I), the compound is shown in the specification,
represents the lower boundary of the pipeline m; pE.mRepresenting the power supplied by line m and consumed by the compressor or circulation pump, which is an additional constraint when m supplies energy to the plant. Notably, the new state-CES.m≤LmThe working point is safe in consideration of controllability of charging and discharging states of the stored energy, wherein the working point is less than or equal to 0 and represents a special working condition that the stored energy is charged by another energy hub.
With respect to step 103: constructing a regional comprehensive energy system maximum energy supply capacity model correspondingly considering the energy storage device by taking the safety boundary expression of the energy storage device as a constraint condition for maximum energy supply capacity optimization solution;
the TSC working point is used as a critical working point on a safety boundary, the optimization goal is that the system energy supply capacity is maximum, and the constraint condition is safety domain model constraint. For convenience of analysis, the TSC mathematical model of the regional integrated energy system can be briefly described as follows:
-TSC is the optimization target; h (L) is a constrained set of energy balance equations; w (L) is a safety check inequality constraint set of an energy hub key device and a key pipeline outlet N-1; and L is an energy hub key pipeline section outlet load set and is a free variable in the optimization solving process of the primal-dual interior point method.
With respect to step 104: selecting a two-dimensional or three-dimensional observation variable based on the solved maximum energy supply capacity working point of the regional comprehensive energy system, and performing dimension reduction observation on the security domains of the regional comprehensive energy system before and after the energy storage device is considered to be accessed;
the comprehensive energy system safety boundary simulation fitting solving process considering the energy storage is described as follows:
step I: and solving the maximum energy supply capacity and the load distribution. Initializing system parameters including a topological structure, equipment parameters, algorithm parameters and the like; the maximum energy supply capacity of the electric-thermal coupling comprehensive energy system is taken as an optimization target, a practical safety domain model is taken as a constraint condition, a master-dual inner point method is called according to a flow to solve TSC working points of the electric-thermal coupling comprehensive energy system, and the TSC and the whole network load distribution when the TSC is achieved are obtained.
Step II: a critical point array is obtained. Selecting any one group of multi-energy pipeline outlet load combination Lb＝(Lm,Ln,Lo) The other variables are fixed as the load of the pipeline section when the TSC is distributed; order (L)m,Ln) Are limited to upper limits by step sizes DeltaL respectively
Approaching until reaching the upper limit of the working point, solving the L when the working point meets the multi-energy flow energy balance condition, and enabling the security domain model to constrain energy hub key equipment and the key pipeline outlet N-1 safety inequality constraint) to pass through the critical conditionoAnd load distribution, and setting the operating point Lb＝(Lm,Ln,Lo) Record it to the critical point array B.
Step III: and (5) performing critical point array fitting. And fitting the critical point array B by using a least square method to obtain a three-dimensional visual boundary of the security domain.
The step of selecting a two-dimensional observation variable to perform dimensionality reduction observation on the security domains of the regional comprehensive energy system before and after the energy storage device is considered to be accessed is the same as the three-dimensional principle.
With respect to step 105: by observing the change condition of the security domain of the system before and after the energy storage access, the change of the security before and after the energy storage device is accessed into the system is analyzed quickly and accurately.
Based on the dimensionality reduction observation of the security domain of the comprehensive energy system, the N-1 security influence after the energy storage access system can be quantitatively described by comparing the area change of the two-dimensional security domain before and after the energy storage access system at different positions, the volume change condition of the three-dimensional security domain and whether the security domain expansion is in the same quadrant.
The feasibility of the method provided by the embodiments of the present invention is verified by the following specific experiments, which are described in detail below:
referring to a regional comprehensive energy system in a certain case, an example scene is set, the multi-energy coupling equipment comprises cogeneration, a gas boiler, a circulating pump and a compressor, and an example topological structure is shown in fig. 2. The energy storage device is connected to point P1. The power factor of the power distribution system is 0.85.
The TSC of the system needs to be calculated before two-dimensional and three-dimensional observations of the security domain of the integrated energy system are made. Based on an interior point method, the calculation result of the TSC of the example under the situation of energy storage access is 16.85MW, and the load distribution of each key pipeline is shown in Table 1. The TSC solution without the energy storage access scenario results in 16.35MW, and the load distribution of each critical pipeline is shown in table 2.
TABLE 1 Key pipeline load distribution with energy storage Access scenarios
TABLE 2 Key pipeline load distribution under non-energy storage Access scenarios
Selection of the Critical line Outlet (L)6、L7) The other pipeline loads are fixed at the TSC operating point. For comparison, a scene without stored energy is established, and other conditions are unchanged. By fitting critical workThe points are used to solve the two-dimensional safety boundaries of the two scenarios, as shown in fig. 3 and 4. The safety domain area is expanded by about 52.5%, with 27.6% being the trans-quadrant expansion.
Selection of the Critical line Outlet (L)1，L2，L6) The other pipeline loads are fixed at the TSC operating point. For comparison, a scene without stored energy is established, and other conditions are unchanged. The two-dimensional safety boundaries of the two scenes are solved by fitting the critical operating points, as shown in fig. 5 and 6. The security domain is expanded by about 47.3%, all over a quadrant expansion.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the above-described embodiments of the present invention are merely provided for description and do not represent the merits of the embodiments.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A method for analyzing the influence of stored energy on the safety of a regional comprehensive energy system is characterized by comprising the following steps:
based on the safety criterion of the regional comprehensive energy system N-1, taking the faults of the key equipment of the energy hub and the outlet of the key energy supply pipeline as an expected accident, acquiring the safety constraints of the key equipment and the key pipeline of the regional comprehensive energy system after the energy storage device is connected, and reasonably simplifying the voltage, air pressure and water pressure limiting nonlinear constraints by combining with the engineering practice;
constructing a practical safety boundary expression of the regional comprehensive energy system considering the access of the energy storage device based on the simplified practical safety domain method of the regional comprehensive energy system, and describing the safety condition of the regional comprehensive energy system N-1;
based on a safety boundary expression considering the energy storage device, taking the safety boundary expression as a constraint condition for optimal solution of the maximum energy supply capacity, constructing a system maximum energy supply capacity model correspondingly considering the energy storage device, and performing optimal solution to obtain a maximum energy supply capacity working point of the regional comprehensive energy system;
selecting a two-dimensional or three-dimensional observation variable based on the solved maximum energy supply capacity working point of the regional comprehensive energy system, and performing dimension reduction observation on the security domains of the regional comprehensive energy system before and after the energy storage device is considered to be accessed;
by observing the security domain change condition of the regional comprehensive energy system before and after the energy storage device is accessed, the security change before and after the energy storage device is accessed to the regional comprehensive energy system is analyzed.
2. The method for analyzing the influence of energy storage on the safety of the regional integrated energy system according to claim 1, wherein the step of obtaining the safety constraints of the critical equipment and the critical pipelines of the regional integrated energy system after the energy storage device is accessed is carried out, and the step of reasonably simplifying the voltage, air pressure and water pressure limiting nonlinear constraints in combination with engineering practice specifically comprises the steps of:
the safety constraint of the regional integrated energy system N-1 is obtained based on the N-1 safety criterion; assuming that the residual energy of the energy storage device is enough to support and finish the tape transferring time required by the regional comprehensive energy system, the safety constraint describes that the regional comprehensive energy system transfers the load through other energy supply equipment and the energy storage device under the condition of the most serious fault, so that the load is not lost after the fault; therefore, the safety constraint of the regional comprehensive energy system N-1 comprises equipment capacity constraint after belt transfer, pipeline transmission capacity constraint after belt transfer and voltage and air pressure operation parameter constraint; only taking the key equipment and key pipeline capacity constraint of the regional comprehensive energy system after the energy storage device is accessed as the safety constraint of the regional comprehensive energy system N-1;
only considering the maximum charging and discharging energy power of the energy storage device, the simplified model of the energy storage device is as follows:
CES＝Pc·ηc＝Pd·ηd
in the formula，CESThe method comprises the steps of representing the charge and discharge power of an energy storage device, namely the power capacity of stored energy, and hereinafter referred to as capacity for short; pc、PdRespectively representing the maximum charge and discharge power of stored energy; etac、ηdRespectively representing the charge and discharge efficiency conditions of stored energy;
the key equipment of the regional comprehensive energy system comprises an energy storage device, a transformer, a CHP (chemical vapor deposition) device, a gas boiler, a circulating pump and a compressor; when the key equipment in the energy hub stops running due to faults, the load of a fault area is transferred to the interconnected key equipment; the safety constraint of the key equipment N-1 of the regional comprehensive energy system considering the access of the energy storage device is as follows:
in the formula (I), the compound is shown in the specification,
representing the load transferred from critical device i to device j due to a failure of device i or the pipeline connected thereto;
represents the original load provided by device j; cjRepresents the capacity of device j; k is an overload coefficient and takes the value of 1; cES.i、CES.jRespectively representing the discharge power of the energy storage systems connected to the devices i and j, and taking a negative value when charging; phijRepresents the critical group of pipes connected to j; l isxRepresents the load at which the pipeline x is energized;
the key pipeline is positioned at the outlet of the energy supply equipment; when one key pipeline stops running due to an N-1 accident, the load provided by the key pipeline is transferred to other interconnected key pipelines; the safety constraint of a key energy supply pipeline N-1 of the regional comprehensive energy system considering the access of the energy storage device is as follows:
in the formula (I), the compound is shown in the specification,
represents the load transferred from critical pipeline m to critical pipeline n due to a failure of m or the equipment connected thereto;
represents the original load of pipeline n; cnRepresents the rated capacity of the pipeline n; cES.mRepresenting the discharge power of the stored energy connected to m.
3. The method for analyzing the influence of energy storage on the safety of the regional integrated energy system according to claim 1, wherein the expression of the practical safety boundary of the regional integrated energy system considering the access of the energy storage device is as follows:
in the formula (I), the compound is shown in the specification,
represents the upper boundary of the m-pipe;
representing an additional constraint when n is a multi-energy coupling device;
representing the load transferred from critical device i to device j due to a failure of device i or the pipeline connected thereto;
represents the original load provided by device j; cjRepresents the capacity of device j; k is an overload coefficient and takes the value of 1; cES.i、CES.jRespectively representing the discharge power of the energy storage systems connected to the devices i and j, and taking a negative value when charging; cnRepresents the rated capacity of the pipeline n; cES.mA discharge power representing the stored energy connected to m;
in the formula (I), the compound is shown in the specification,
represents the lower boundary of the pipeline m; pE.mRepresents the power supplied by line m and consumed by the compressor or circulation pump, which is an additional constraint when m supplies energy to the compressor or circulation pump; wherein, the new state-CES.m≤Lm0 or less represents a special condition where the stored energy is charged by another energy hub, where LmRepresenting the outlet load of the critical pipeline connected with the stored energy, at-C in view of the controllability of the charging and discharging state of the stored energyES.m≤LmThe working point less than or equal to 0 is safe.
4. The method for analyzing the influence of energy storage on the safety of the regional integrated energy system according to claim 1, wherein the model considering the maximum energy supply capacity of the system of the energy storage device is as follows:
in the formula, hP(L)＝0、hN(L)＝0、hH(L)＝0、hEH(L) ═ 0 represents the energy balance equation corresponding to the power system, natural gas system, thermodynamic system and energy hub; wmin≤W(L)≤WmaxRepresenting regional synthesis taking into account energy storage device accessThe energy system N-1 safety constraint inequality comprises key equipment in an energy hub and key pipeline safety verification;
the maximum energy supply capacity model of the regional comprehensive energy system with the energy storage device connected is taken as an optimization solving model, the optimization target is that the sum of the loads of the working points is maximum, and the constraint conditions are power balance constraint of each energy subsystem and N-1 safety constraint of the regional comprehensive energy system with the energy storage device connected.
5. The method for analyzing the influence of energy storage on the safety of the regional integrated energy system according to claim 1, wherein two-dimensional or three-dimensional observation variables are selected, and the dimension reduction observation of the security domain of the regional integrated energy system before and after considering the access of the energy storage device is specifically as follows:
(1) solving the maximum energy supply capacity and load distribution; initializing parameters including a topological structure, equipment parameters and algorithm parameters; the method comprises the steps of taking the maximum energy supply capacity of the electric-thermal coupling comprehensive energy system as an optimization target, taking a practical safety domain model as a constraint condition, solving TSC working points of the electric-thermal coupling comprehensive energy system according to a flow calling original dual inner point method, and obtaining the TSC and the whole network load distribution when the TSC is achieved;
(2) obtaining a critical point array; selecting any one group of multi-energy pipeline outlet load combination Lb＝(Lm,Ln,Lo) Is a free variable, Lm,Ln,LoRespectively selecting three outlet load variables, and fixing the other variables as pipeline section loads when the TSC is distributed; order (L)m,Ln) Are limited to upper limits by step sizes DeltaL respectively
Approaching until reaching the upper limit of the working point, solving the L when the working point meets the multi-energy flow energy balance condition, and enabling the safety domain model to restrict the energy hub key equipment and the key pipeline outlet N-1 safety inequality to restrict the critical passing each timeoAnd load distribution, and setting the operating point Lb＝(Lm,Ln,Lo) Recording the data into a critical point array B;
(3) performing critical point array fitting; fitting the critical point array B by using a least square method to obtain a three-dimensional visual boundary of the security domain;
the step of selecting a two-dimensional observation variable to perform dimensionality reduction observation on the security domains of the regional comprehensive energy system before and after the energy storage device is considered to be accessed is the same as the three-dimensional principle.
6. The method for analyzing the influence of energy storage on the safety of the regional integrated energy system according to claim 1, wherein analyzing the change of the safety of the energy storage device before and after accessing the regional integrated energy system by observing the change of the safety domain of the regional integrated energy system before and after accessing the energy storage device specifically comprises:
based on the dimensionality reduction observation of the security domain of the comprehensive energy system, the N-1 security influence after the energy storage access system can be quantitatively described by comparing the area change of the two-dimensional security domain, the volume change condition of the three-dimensional security domain and whether the security domain expansion is in the same quadrant before and after the comprehensive energy system with different capacities and different position energy storage access regions.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111416340A (en) * | 2020-03-10 | 2020-07-14 | 天津大学 | Regional comprehensive energy system optimization control method based on practical security domain |
| US20210203159A1 (en) * | 2019-12-27 | 2021-07-01 | North China Electric Power University | Power load forecasting method in multi-energy coupling mode |
| CN113486509A (en) * | 2021-07-01 | 2021-10-08 | 天津大学 | Multi-objective optimization control method for comprehensive energy system |
-
2021
- 2021-11-09 CN CN202111318975.5A patent/CN113872224A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210203159A1 (en) * | 2019-12-27 | 2021-07-01 | North China Electric Power University | Power load forecasting method in multi-energy coupling mode |
| CN111416340A (en) * | 2020-03-10 | 2020-07-14 | 天津大学 | Regional comprehensive energy system optimization control method based on practical security domain |
| CN113486509A (en) * | 2021-07-01 | 2021-10-08 | 天津大学 | Multi-objective optimization control method for comprehensive energy system |
Non-Patent Citations (2)
| Title |
|---|
| 刘柳: "面向区域综合能源系统的安全域研究", 万方, pages 25 - 31 * |
| 刘铠诚等: "Security Analysis of Regional Integrated Energy System Integrating Energy Storage", E3S WEB OF CONFERENCES AESEE 2021, pages 1 - 6 * |
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