CN110707705A - Power flow sequence analysis model of electric-gas coupling comprehensive energy system - Google Patents
Power flow sequence analysis model of electric-gas coupling comprehensive energy system Download PDFInfo
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Abstract
The invention relates to the field of large-scale new energy grid-connected power generation, in particular to an electric-gas coupling comprehensive energy system tide sequence analysis model. The method provides theoretical basis for normal and stable operation of the comprehensive energy system and analysis of new energy consumption capability.
Description
Technical Field
The invention relates to the field of large-scale new energy grid-connected power generation, in particular to an electric-gas coupling comprehensive energy system power flow sequence analysis model under the condition of large-scale new energy grid connection.
Background
The proportion of the non-fossil energy power generation amount to the total power generation amount reaches 50% in estimated 2030 years; in 2050 years, the total amount of new energy is basically stable, and a modern energy system is built. In certain time periods, the ratio of the wind power output of the province in the northwest of China exceeds 50%, and the wind power output of the province in the northeast of China even reaches 71% of the current load. In recent years, the power generation amount of new energy of Ningxia power grid reaches 1100 ten thousand kilowatts, which accounts for 49% of the total power generation amount and reaches 102% of power load. With the continuous improvement of the permeability of new energy, the uncertain factors of EGCIES increase, in order to reduce the influence of the uncertain factors on the system, experts propose an energy complementation concept, and an integrated energy system should be operated, and the existing integrated energy system mainly comprises a power system, a natural gas system and the like.
With the increase of Electric Power System (EPS) and Natural Gas System (NGS) conversion equipment, the energy coupling degree is becoming deeper and the load demand is more diversified, and it is very necessary to research a Power flow model of an Electro-Gas Coupled Integrated energy System (EGCIES).
The reasonable modeling of EGCIES is the basis for carrying out load flow calculation on the EGCIES. Some documents propose dynamic interaction models of EPS and NGS systems that take into account the transient behavior of various micro gas turbines and natural gas; an EGCIES steady state solving model is constructed in part of documents, and the influence of state changes such as gas quality, load adjustment and introduction of gas injection points on EGCIES is quantitatively evaluated; and uncertainty of source-load sides is calculated in part of documents, and an EGCIES robust random optimization scheduling model considering an electricity-to-gas refined model is constructed. The research establishes a model of the EGCIES coupling element in detail, but the influence of the established model on the EGCIES load flow calculation is not systematically researched.
In summary, the main difficult problems of the comprehensive energy system research are as follows: under the condition that a power supply point, an air source point, an electric load, an air load, a grid structure of an electric power system and a grid structure of a natural gas system of the comprehensive energy system are known, the node air pressure and the pipeline air flow of the natural gas system and the node voltage and the line power of the electric power system are rapidly solved; and how to quickly and accurately evaluate the coupling capacity of the power system and the natural gas system to obtain the practical and feasible trend of the electricity-gas coupling comprehensive energy system.
The load flow analysis model is a comprehensive energy system formed by an electric power system and a natural gas system, the node voltage and the line power of the electric power system, the node air pressure of the natural gas system, the pipeline flow and the energy conversion of a coupling element are analyzed according to the given original data of the system, load flow calculation is the basis of system stability analysis, and the load flow analysis model is a basic method for solving system load flow distribution and has very clear physical significance and practical value.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to accurately evaluate the running condition of the comprehensive energy system under the condition of large-scale new energy access, particularly how to research the large-scale new energy grid connection, particularly how to establish an electric-gas coupling comprehensive energy system tide sequence analysis model under the condition of grid connection access of an electric power system and a natural gas system, and further research the mutual influence between the electric power system and the natural gas system.
The invention is realized by adopting the following technical scheme: an electric-gas coupling comprehensive energy system tide sequence analysis model comprises the following steps:
when the output of the new energy unit is less than or equal to the electric load requirement
(S1) calculating the output electric power P of the EPS gas turbine of the electric power systemeAcquiring the energy interaction value P of the residential energy concentrator and the gas networkg；
(S2) solving the NGS load flow of the natural gas system, and calculating the power consumption H of the pressurizer;
(S3) calculating the electric power consumption H of the pressurizer into the output electric power P of the EPS gas turbineePerforming EPS load flow calculation again, calculating the output of the gas turbine set, outputting a load flow result if the relative value of the output of the gas turbine set of the first EPS load flow calculation and the second EPS load flow calculation is within an error range, otherwise, solving the power of the energy coupling element and the EPS and NGS load flows again until the output value of the gas turbine set meets the error requirement;
when the output of the new energy unit is greater than the electric load demand
(SS1) solving the EPS trend, determining the required output of the new energy unit, determining the actual output of the new energy unit according to the illumination intensity and the wind speed, and solving the electric quantity P which cannot be absorbed by the new energy unitg1；
(SS2) solving the natural gas quantity generated by the electric gas conversion equipment through the electric gas conversion equipment, substituting the natural gas quantity into the NGS, solving the NGS load flow, and calculating the power consumption of the pressurizer;
(SS3) calculating the electric power consumption of the pressurizer into the EPS, calculating the EPS tidal current again, calculating the natural gas amount generated by the electric gas conversion equipment, outputting a tidal current result if the relative value of the natural gas amount generated by the electric gas conversion equipment calculated by the EPS tidal current for the first time and the natural gas amount generated by the electric gas conversion equipment calculated by the EPS tidal current for the second time is within an error range, and otherwise, solving the power of the energy coupling element and the EPS and NGS tidal currents again until the output value of the gas turbine set meets the error requirement.
Compared with the existing research, the invention provides a sequential solving model of the tidal current of the electric-gas coupling integrated energy system, and the EGCIES tidal current is solved by considering the output uncertainty of a new energy source unit and the random fluctuation of the electric load and the gas load under the condition of considering the energy coupling relation between an Electric Power System (EPS) and a Natural Gas System (NGS).
And solving the natural gas amount required to be consumed by the gas turbine according to the EPS trend, replacing the natural gas amount into a natural gas system, solving the NGS trend, determining the electric energy required to be consumed by the pressurizer, bringing the electric energy back to the EPS, and solving the EPS trend again until the output of the gas turbine unit meets the constraint condition to obtain the EGCIES trend.
Under the condition of large-scale new energy grid connection, if the output of the new energy source unit meets the requirement of EPS electric load, all gas turbine units are shut down according to the policy of preferential consumption of new energy, the output of each new energy source unit is solved, the power of the new energy source unit which cannot be consumed by EPS is solved, the new energy source unit is stored in NGS through electric-to-gas equipment and substituted into a natural gas system, the trend of the natural gas system is solved, the electric power required to be consumed by a pressurizer is determined, and the comprehensive energy source system trend is solved in an iterative manner.
Detailed Description
An electric-gas coupling comprehensive energy system tide sequence analysis model comprises the following steps
S1: the output of the new energy unit is less than the electric load requirement
(1) Calculating the output electric power P of the EPS gas turbineeAcquiring the energy interaction value P of the residential energy concentrator and the gas networkgSolving the power system trend according to the data of the given comprehensive energy system to obtain the output of the gas turbine set, and adding the output of the gas turbine set to obtain an energy interaction value;
(2) solving the NGS power flow, and calculating the power consumption H of the pressurizer; and solving the trend of the natural gas system to obtain the pipeline flow and the node air pressure of the natural gas system, and calculating the power consumption of the pressurizer according to the node air pressure and the pipeline flow by using the following formula.
T0＝288K、π0The equivalent electric power consumed by the pressurizer is 101.03kPa as shown below.
In the formula
fkmnIs the amount of air flow through the pressurizer; zkA compression factor for the gas charge; t iskIs the pressurizer temperature; etakTo compressor efficiency; r is the gas adiabatic index (pi)mIs the node air pressure of the m node, pinNode air pressure at n-node).
(3) And calculating the output of the gas turbine set by calculating the EPS flow, outputting a flow result if the relative value of the output of the gas turbine set calculated by the EPS flow calculation for the first time and the output of the gas turbine set calculated by the EPS flow calculation for the second time is within an error range, and otherwise, solving the power of the energy coupling element and the EPS and NGS flows again until the output value of the gas turbine set meets the error requirement.
S2: the output of the new energy unit is greater than the electric load demand
(1) Solving the EPS trend, determining the required output of the new energy source unit, determining the actual output of the new energy source unit according to the illumination intensity and the wind speed, and solving the electric quantity P which cannot be absorbed by the new energy source unitg1；
(2) Solving the natural gas amount generated by the electric gas conversion equipment through the electric gas conversion equipment, substituting the natural gas amount into the NGS, solving the NGS load flow, and calculating the power consumption of the pressurizer;
(3) and calculating the electric power consumption of the pressurizer into the EPS, performing EPS load flow calculation again, calculating the natural gas amount generated by the electric gas conversion equipment, outputting a load flow result if the relative value of the natural gas amount generated by the electric gas conversion equipment in the first EPS load flow calculation and the second EPS load flow calculation is within an error range, and otherwise, solving the power of the energy coupling element and the EPS and NGS load flows again until the output value of the gas turbine set meets the error requirement.
The method is characterized by establishing a power flow sequence analysis model of the electric-gas coupling comprehensive energy system under the condition of large-scale new energy grid connection, and comprising the following steps of:
s1: the output of the new energy unit is less than the electric load requirement
(1) Calculating the output electric power P of the EPS gas turbineeAcquiring the energy interaction value P of the residential energy concentrator and the gas networkg；
(2) Solving the NGS power flow, and calculating the power consumption H of the pressurizer;
(3) and calculating the output of the gas turbine set by calculating the EPS flow, outputting a flow result if the relative value of the output of the gas turbine set calculated by the EPS flow calculation for the first time and the output of the gas turbine set calculated by the EPS flow calculation for the second time is within an error range, and otherwise, solving the power of the energy coupling element and the EPS and NGS flows again until the output value of the gas turbine set meets the error requirement.
S2: the output of the new energy unit is greater than the electric load demand
(1) Solving the EPS trend, determining the required output of the new energy source unit, determining the actual output of the new energy source unit according to the illumination intensity and the wind speed, and solving the electric quantity P which cannot be absorbed by the new energy source unitg1；
(2) Solving the natural gas amount generated by the electric gas conversion equipment through the electric gas conversion equipment, substituting the natural gas amount into the NGS, solving the NGS load flow, and calculating the power consumption of the pressurizer;
(3) and calculating the electric power consumption of the pressurizer into the EPS, performing EPS load flow calculation again, calculating the natural gas amount generated by the electric gas conversion equipment, outputting a load flow result if the relative value of the natural gas amount generated by the electric gas conversion equipment in the first EPS load flow calculation and the second EPS load flow calculation is within an error range, and otherwise, solving the power of the energy coupling element and the EPS and NGS load flows again until the output value of the gas turbine set meets the error requirement.
According to the tidal current calculation result of the comprehensive energy system, the line power and node voltage of the power system, the pipeline flow and node air pressure of the natural gas system and the energy conversion capacity of the energy coupling link can be obtained, and theoretical basis is provided for the normal and stable operation of the comprehensive energy system and the analysis of the new energy consumption capacity.
The invention relates to a power flow sequence analysis model of an electric-gas coupling comprehensive energy system, in particular to a power flow sequence analysis model of the electric-gas coupling comprehensive energy system under the condition of large-scale new energy grid connection.
The invention provides an electric-gas coupling comprehensive energy System Power flow sequence analysis model under the condition of large-scale new energy grid connection, under the condition of considering the energy coupling relation between an Electric Power System (EPS) and a Natural Gas System (NGS), the EGCIES Power flow is solved by considering the output uncertainty of a new energy unit and the random fluctuation of electric load and gas load, the node voltage, the node air pressure, the line Power and the energy conversion capacity of a pipeline flowmeter coupling link of the System are obtained, and reference are provided for the normal stable operation of the comprehensive energy System and the consumption of new energy.
Under the condition of large-scale new energy grid connection, if the output of the new energy source unit meets the requirement of EPS electric load, all gas turbine units are shut down according to the policy of preferential consumption of new energy, the output of each new energy source unit is solved, the power of the new energy source unit which cannot be consumed by EPS is solved, the new energy source unit is stored in NGS through electric-to-gas equipment and substituted into a natural gas system, the trend of the natural gas system is solved, the electric power required to be consumed by a pressurizer is determined, and the comprehensive energy source system trend is solved in an iterative manner.
Under the condition that the output of the new energy unit is smaller than the electric load demand, the first step: calculating the EPS trend, and solving the natural gas amount required to be consumed by the gas turbine; step two: solving the trend of a natural gas system according to the amount of natural gas required to be consumed by the gas turbine; step three: solving the electric energy required to be consumed by the pressurizer according to the flow of the natural gas system; step four: and (4) bringing the electric energy consumed by the pressurizer back to the electric power system again, and iteratively solving the flow of the comprehensive energy system.
Under the condition that the output of the new energy unit is greater than the electric load demand, the first step: according to the policy of preferential consumption of the new energy, stopping all the gas turbine sets, solving the output of each new energy set, and obtaining the power of the new energy set which cannot be consumed by the EPS; step two: solving the natural gas amount generated by the electric gas conversion equipment according to the power of the new energy unit which can not be absorbed by the EPS; step three: solving the trend of a natural gas system according to the amount of natural gas generated by the electric gas conversion equipment to obtain the electric power consumed by the pressurizer; step four: and (4) bringing the electric energy consumed by the pressurizer back to the electric power system again, and iteratively solving the flow of the comprehensive energy system.
The invention provides a sequential solving model of an electricity-Gas coupling comprehensive energy System Power flow, which solves the EGCIES Power flow by considering the uncertainty of the output of a new energy unit and the random fluctuation of an electric load and a Gas load under the condition of considering the energy coupling relation between an Electric Power System (EPS) and a Natural Gas System (NGS).
And solving the natural gas amount required to be consumed by the gas turbine according to the EPS trend, replacing the natural gas amount into a natural gas system, solving the NGS trend, determining the electric energy required to be consumed by the pressurizer, bringing the electric energy back to the EPS, and solving the EPS trend again until the output of the gas turbine unit meets the constraint condition to obtain the EGCIES trend.
Under the condition of large-scale new energy grid connection, if the output of a new energy unit meets the requirement of EPS (electric power storage) electric load, stopping running all gas turbine units according to the policy of preferential consumption of new energy, solving the output of each new energy unit, solving the power of the new energy unit which cannot be consumed by EPS, storing the power in NGS (natural gas system) through electric-to-gas conversion equipment, substituting the power into a natural gas system, solving the trend of the natural gas system, determining the electric power required to be consumed by a pressurizer, iteratively solving the trend of the comprehensive energy system, obtaining the node voltage, the node air pressure, the line power and the energy conversion capacity of a coupling link of a pipeline flowmeter of the system, and providing reference and reference for normal stable operation of the comprehensive energy system and consumption of the new energy.
Claims (1)
1. An electric-gas coupling comprehensive energy system tide sequence analysis model comprises the following steps:
when the output of the new energy unit is less than or equal to the electric load requirement
(S1) calculating the output electric power P of the EPS gas turbine of the electric power systemeAcquiring the energy interaction value P of the residential energy concentrator and the gas networkg；
(S2) solving the NGS load flow of the natural gas system, and calculating the power consumption H of the pressurizer;
(S3) calculating the electric power consumption H of the pressurizer into the output electric power P of the EPS gas turbineeIn the method, EPS load flow calculation is carried out again, the output of the gas turbine set is calculated, if the relative value of the output of the gas turbine set of the first EPS load flow calculation and the second EPS load flow calculation is within an error range, a load flow result is output, otherwise, the power of the energy coupling element and EPS and NGS loads are solved againFlowing until the output value of the gas turbine unit meets the error requirement;
when the output of the new energy unit is greater than the electric load demand
(SS1) solving the EPS trend, determining the required output of the new energy unit, determining the actual output of the new energy unit according to the illumination intensity and the wind speed, and solving the electric quantity P which cannot be absorbed by the new energy unitg1；
(SS2) solving the natural gas quantity generated by the electric gas conversion equipment through the electric gas conversion equipment, substituting the natural gas quantity into the NGS, solving the NGS load flow, and calculating the power consumption of the pressurizer;
(SS3) calculating the electric power consumption of the pressurizer into the EPS, calculating the EPS load flow again, calculating the natural gas quantity generated by the electric gas conversion equipment, outputting a load flow result if the relative value of the natural gas quantity generated by the electric gas conversion equipment in the first EPS load flow calculation and the second EPS load flow calculation is within an error range, otherwise, solving the power of the energy coupling element and the EPS and NGS load flows again until the output value of the gas turbine set meets the error requirement.
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