CN103956742B - The defining method of power system operation mode under a kind of complicated energy environment - Google Patents
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Abstract
The invention provides the defining method of power system operation mode under a kind of complicated energy environment, belong to power system safety and stability analysis field.The method comprises: the preliminary operational mode of generating power system, and determines busbar voltage control range; Carry out single element safety and stability to calculate, and it is assessed; The safety and stability of carrying out under catastrophe failure impact calculates, and determines final power system operation mode.The present invention is directed to honourable fiery bundling and send the problem that Energy Base mode determines outside, by the specificity analysis to scene fiery new forms of energy electricity sent outside system, a kind of method utilizing the comparative analysis of various power supply different proportion start-up mode is proposed, can by the accident analysis under various unit commitment mode, the requirement of N-1 is met after guaranteeing the system failure, and make the peace control means amount of system after catastrophe failure that occurs minimum, and create favorable conditions for post-fault system recovery.
Description
Technical field
The invention belongs to power system safety and stability analysis technical field, be specifically related to the defining method of power system operation mode under a kind of complicated energy environment.
Background technology
The wind energy of northwest China and Luminous energy resource comparatively horn of plenty, local load level is lower, and system scale is little, and wind-light-electricity digestion capability is very limited, extensive wind-light-electricity (wind-powered electricity generation, photovoltaic and thermoelectricity, be called for short wind-light-electricity) must be delivered to other regions and dissolves by remote conveying.Wind-light-electricity annual utilization hours is low, and independent long-distance transmissions economy is very poor; Meanwhile, the frequent fluctuation pole of transmission line windward photoelectric power is unfavorable for the safe and stable operation of system.Take wind-powered electricity generation photoelectricity thermoelectricity bundling to send the fluctuation that strategy can not only effectively reduce line power outside, but also be conducive to the safety and stability of system, obviously reduce the power supply cost of receiving end electric power system simultaneously.
But along with fiery the building up of bundling Energy Base of more and more Large Copacity scene is put into operation, while bringing great economic benefit, its dynamic behaviour becomes and becomes increasingly complex, and also therefore great changes will take place for the safety and stability characteristic of electric power system.
By the impact of the problems such as economy, the energy and environmental change, the development and utilization of various countries to new forms of energy is in recent years more.But different due to natural conditions and power system environment, utilization of new energy resources mode both domestic and external is also different.The most sporadic development of external new forms of energy, access nearby, electric power system contacts tight technology maturation, and develops in harmony with other power supplys; Domestic then by the impact of natural resources distribution, generation of electricity by new energy presents high concentrated, long distance power transmission, and peak modulation capacity is not enough and the feature that networking is more weak.
State's new forms of energy such as current Germany, Denmark and load center geographic distance relatively short, large polydispersion accesses nearby, on-site elimination, and therefore development cost is also lower.American-European countries also greatly develops the strong unit of the regulating power such as fuel oil, combustion gas, to meet the needs of wind-powered electricity generation large-scale grid connection while development generation of electricity by new energy.Closely, transmission transfer capability is strong, dissolves provide solid foundation for generation of electricity by new energy is transregional, transnational for the contact of its electric power system simultaneously.External new clothes blower fan all possesses meritorious/Reactive-power control ability and low voltage ride-through capability, and new photovoltaic power generation grid-connecting directive/guide it is also proposed similar requirement.
The new forms of energy such as Wind Power In China, photovoltaic generation are distributed in the places such as northwest, Inner Mongol and northeast mostly, and away from load center, electric energy must be carried by remote Large Copacity, and therefore development cost is relatively high; The power supply of China, based on thermoelectricity, accounts for 76% of total installation of generating capacity at present, and peak shaving fm capacity is limited, peak-valley difference is large; And region is broad, each regional power system span is large, and contact more weak between regional power system, transmission transfer capability is not strong.In addition, the starting such as wind-powered electricity generation, photovoltaic generation is relatively external more late, and technology is relatively immature, and Wind turbines and photovoltaic plant be meritorious/Reactive-power control ability, much do not possess low voltage ride-through capability.
Therefore, be necessary to further investigate the method determined of system operation mode under the fiery complicated energy environment of scene of considering, ensure system stable operation with minimum cost.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides the defining method of power system operation mode under a kind of complicated energy environment, the problem that Energy Base mode determines is sent outside for the fiery bundling of scene, by the specificity analysis to scene fiery new forms of energy electricity sent outside system, a kind of method utilizing the comparative analysis of various power supply different proportion start-up mode is proposed, can by the accident analysis under various unit commitment mode, the requirement of N-1 is met after guaranteeing the system failure, and the peace control means amount of system is minimum after making generation catastrophe failure, and for post-fault system recover create favorable conditions.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides the defining method of power system operation mode under a kind of complicated energy environment, complicated energy environment is the environment that wind-powered electricity generation, photovoltaic and thermoelectricity have concurrently, said method comprising the steps of:
Step 1: the preliminary operational mode of generating power system, and determine busbar voltage control range;
Step 2: carry out single element safety and stability and calculate, and it is assessed;
Step 3: the safety and stability of carrying out under catastrophe failure impact calculates, and determines final power system operation mode.
Described step 1 comprises the following steps:
Step 1-1: according to yearly load curve, load prediction and power system load capacity, determines large load power demands year maximum or Smaller load power demands year minimum value;
Step 1-2: according to respective installed capacity and the Regional Distribution of wind-powered electricity generation, photovoltaic, fired power generating unit in electric power system, the Seasonal Characteristics that combination is determined, generates various generating combination;
Step 1-3: according to the various generating combinations generated, calculate electric power system each section ability to transmit electricity limit;
Step 1-4: the difference of the lower electric power system each section ability to transmit electricity limit of the different generating combination of contrast, preferably reasonably generate electricity combination, the preliminary operational mode of generating power system;
Step 1-5: for the preliminary operational mode of electric power system generated, determine busbar voltage control range.
In described step 1-2, generating set comprises wind-powered electricity generation large originating party formula, photovoltaic large originating party formula or the large originating party formula of thermoelectricity.
In described step 1-3, calculating electric power system each section ability to transmit electricity limit process is: the formation first determining section, progressively increases sending end start amount, reduces receiving end start amount; Then N-1 fault is checked, until system unstability; Finally calculate the section ability to transmit electricity limit.
In described step 1-4, according to generating set on the principle of ability to transmit electricity impact, preferably to generate electricity combination according to following standard;
1) each section ability to transmit electricity limit meets and send powered capacity requirement by the load capacity in steps A and the determined each section of the Regional Distribution in step B;
2) reduce influencing each other between each section ability to transmit electricity limit, when avoiding some section power transmission larger, cause other associated sections ability to transmit electricity limit significantly to decline.
In described step 1-5, for the preliminary operational mode of electric power system generated, introduce power system safety and stability constraint, determine busbar voltage control range, realize ensureing the target of scope range of the fluctuation of voltage after power system safety and stability and pre-controlling fault;
Described power system safety and stability constraint refers to that power system operation mode meets the requirement of " power system stability directive/guide "; Busbar voltage control range refers to that busbar voltage meets the requirement of " power system voltage and var fire protection technology ".
Described step 2 comprises the following steps:
Step 2-1: according to the preliminary operational mode of electric power system generated, carries out single element safety and stability and calculates, and assesses it and whether meets power system safety and stability constraint; If meet, then proceed step 2-2; If do not meet, then return step 1-4;
Step 2-2: after judging single element fault, whether power system voltage level affects wind-powered electricity generation, the photovoltaic even stable operation of associated straight streaming system, and then causes cascading failure; If there is impact, then return step 1-5; If without impact, then perform step 3.
In described step 2-1; assess single element whether to meet power system safety and stability constraint criteria and be: power system operation mode meets the requirement of " power system stability directive/guide "; after there is single element fault disturbance in the electric power system namely under normal operating mode; protection, switch and reclosing correct operation; do not take stability contorting measure; keep the normal power supply of power system stability operation and electric power system, other elements are no more than the accident overload ability of regulation, successive trip do not occur.
In described step 2-2, whether there is overvoltage or low voltage condition after assessing single element fault according to evaluation criteria, after judging single element fault, whether power system voltage level affects the wind-powered electricity generation even stable operation of photovoltaic, and then causes cascading failure; Evaluation criteria is: if bus recovery voltage is increased to 1.1p.u. after single element fault, namely thinks and affects wind-powered electricity generation, photovoltaic generation stable operation; If bus voltage resume level is lower than 0.87p.u. after fault, namely thinks and affect direct current system stable operation.
In described step 3, the safety and stability of carrying out catastrophe failure according to the preliminary operational mode of electric power system calculates, and the scale of assessment power system safety and stability control measure amount, is mainly the machine of cutting, cutting load measure amount; If security and stability control measurement amount cost is excessive, then return step 1-4; If security and stability control measurement amount can accept, be namely defined as final power system operation mode set.
Described catastrophe failure comprises the permanent short circuit of electric power system main grid structure electric pressure joint use three-phase and jumps double back fault and direct current locking fault; According to " power system safety and stability control technology directive/guide " standard, if when electric power system generation catastrophe failure causes power system safety and stability to destroy, take to send end cutting machine or the measure of receiving end cutting load, prevent power system collapse, if electric power shifts or loss amount after security and stability control measurement amount exceedes catastrophe failure, think that security and stability control measurement amount cost is excessive, otherwise then think that security and stability control measurement amount can accept.
Compared with prior art, beneficial effect of the present invention is:
The defining method of power system operation mode under a kind of complicated energy environment provided by the invention, the problem that Energy Base mode arranges is sent outside for the fiery bundling of scene, by the specificity analysis to the outer pushing electric network of the fiery new forms of energy of scene, can by the accident analysis under various unit commitment mode, meet the condition of the requirement of N-1 after guaranteeing the system failure under, make the peace control means amount of system after catastrophe failure that occurs minimum, and create favorable conditions for post-fault system recovery.
Accompanying drawing explanation
Fig. 1 is the determination method flow diagram of power system operation mode under complicated energy environment provided by the invention;
Fig. 2 is the electric network composition schematic diagram during the embodiment of the present invention calculates;
Fig. 3 is eastern suburb-Turfan N-2 part 750kV busbar voltage curve under the former mode during inventive embodiments calculates;
Fig. 4 is eastern suburb-Turfan N-2 part 750kV busbar voltage curve under the mode under the fiery complicated energy environment of employing consideration scene during inventive embodiments calculates after system operation mode arrangement method.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Fig. 1, the invention provides the defining method of power system operation mode under a kind of complicated energy environment, complicated energy environment is the environment that wind-powered electricity generation, photovoltaic and thermoelectricity have concurrently, comprises the following steps:
Step 1: the preliminary operational mode of generating power system, and determine busbar voltage control range;
Step 1-1: according to yearly load curve, load prediction and power system load capacity, determines large load power demands year maximum or Smaller load power demands year minimum value;
Step 1-2: according to respective installed capacity and the Regional Distribution of wind-powered electricity generation, photovoltaic, fired power generating unit in electric power system, the Seasonal Characteristics that combination is determined, generates various generating combination;
Generating set comprises wind-powered electricity generation large originating party formula, photovoltaic large originating party formula or the large originating party formula of thermoelectricity;
1) wind-powered electricity generation large originating party formula: actual the exerting oneself of wind-powered electricity generation reaches more than 45% of installed capacity of wind-driven power, and other are not enough, and electric power is born by thermoelectricity and photovoltaic generation;
2) photovoltaic large originating party formula: actual the exerting oneself of photovoltaic reaches more than 80% of photovoltaic generation installed capacity, and other are not enough, and electric power is born by thermoelectricity and wind-powered electricity generation;
3) thermoelectricity large originating party formula: actual the exerting oneself of thermoelectricity reaches more than 90% of thermoelectricity installed capacity; Other are not enough, and electric power is born by wind-powered electricity generation, photovoltaic.
Step 1-3: according to the various generating combinations generated, calculate electric power system each section ability to transmit electricity limit;
Calculating electric power system each section ability to transmit electricity limit process is: the formation first determining section, progressively increases sending end start amount, reduces receiving end start amount; Then N-1 fault is checked, until system unstability; Finally calculate the section ability to transmit electricity limit.
Step 1-4: the difference of the lower electric power system each section ability to transmit electricity limit of the different generating combination of contrast, preferably reasonably generate electricity combination, the preliminary operational mode of generating power system;
In described step 1-4, according to generating set on the principle of ability to transmit electricity impact, preferably to generate electricity combination according to following standard;
1) each section ability to transmit electricity limit meets and send powered capacity requirement by the load capacity in steps A and the determined each section of the Regional Distribution in step B;
2) reduce influencing each other between each section ability to transmit electricity limit, when avoiding some section power transmission larger, cause other associated sections ability to transmit electricity limit significantly to decline.
Step 1-5: for the preliminary operational mode of electric power system generated, determine busbar voltage control range.
For the preliminary operational mode of electric power system generated, introduce power system safety and stability constraint, determine busbar voltage control range, realize ensureing the target of scope range of the fluctuation of voltage after power system safety and stability and pre-controlling fault;
Described power system safety and stability constraint refers to that power system operation mode meets the requirement of " power system stability directive/guide "; Busbar voltage control range refers to that busbar voltage meets the requirement of " power system voltage and var fire protection technology ".
Step 2: carry out single element safety and stability and calculate, and it is assessed;
Step 2-1: according to the preliminary operational mode of electric power system generated, carries out single element safety and stability and calculates, and assesses it and whether meets power system safety and stability constraint; If meet, then proceed step 2-2; If do not meet, then return step 1-4;
Assess single element whether to meet power system safety and stability constraint criteria and be: power system operation mode meets the requirement of " power system stability directive/guide "; after there is single element fault disturbance in the electric power system namely under normal operating mode; protection, switch and reclosing correct operation; do not take stability contorting measure; keep the normal power supply of power system stability operation and electric power system; other elements are no more than the accident overload ability of regulation, successive trip do not occur.
Step 2-2: after judging single element fault, whether power system voltage level affects wind-powered electricity generation, the photovoltaic even stable operation of associated straight streaming system, and then causes cascading failure; If there is impact, then return step 1-5; If without impact, then perform step 3.
Whether there is overvoltage or low voltage condition after assessing single element fault according to evaluation criteria, after judging single element fault, whether power system voltage level affects the wind-powered electricity generation even stable operation of photovoltaic, and then causes cascading failure; Evaluation criteria is: if bus recovery voltage is increased to 1.1p.u. after single element fault, namely thinks and affects wind-powered electricity generation, photovoltaic generation stable operation; If bus voltage resume level is lower than 0.87p.u. after fault, namely thinks and affect direct current system stable operation.
Step 3: the safety and stability of carrying out under catastrophe failure impact calculates, and determines final power system operation mode.
The safety and stability of carrying out catastrophe failure according to the preliminary operational mode of electric power system calculates, and the scale of assessment power system safety and stability control measure amount, is mainly the machine of cutting, cutting load measure amount; If security and stability control measurement amount cost is excessive, then return step 1-4; If security and stability control measurement amount can accept, be namely defined as final power system operation mode set.
Described catastrophe failure comprises the permanent short circuit of electric power system main grid structure electric pressure joint use three-phase and jumps double back fault and direct current locking fault; According to " power system safety and stability control technology directive/guide " standard, if when electric power system generation catastrophe failure causes power system safety and stability to destroy, take to send end cutting machine or the measure of receiving end cutting load, prevent power system collapse, if electric power shifts or loss amount after security and stability control measurement amount exceedes catastrophe failure, think that security and stability control measurement amount cost is excessive, otherwise then think that security and stability control measurement amount can accept.
Cut machine policy co-ordination be optimized for example with wind-powered electricity generation, thermoelectricity after electric power system fault shown in Fig. 2, have following embodiment:
A, build northwest electricity system research forcasted years mode data as Research foundation, trend schematic diagram as shown in Figure 1.
B, Digital Simulation show, eastern suburb-Turfan circuit operate power is 2910MW, after there is N-2 fault in eastern suburb-Turfan circuit, Xinjiang major network will with send a passage outside and two passages disconnect, concrete simulation result is as shown in Figure 2.From simulation result: after off-the-line, the frequency of two parts electric power system is in stability range; But directly cause one, two passage cross sections trends to reduce owing to cut-offfing, passage 750kV busbar voltage is mostly more than 1p.u.(800kV), have influence on device security; Meanwhile, the Kazakhstan 500kV change of current bus of Zheng Zhiliu, the 330kV change of current busbar voltage of Qinghai-Tibet direct current have all exceeded the highest extreme voltage limit value 550kV and 363kV that design manual requires respectively, have had influence on the reliability service of two direct currents.
C, according to the situation after fault, adjustment basal profile, the controlled high resistance on Jiang Shazhou-fish card circuit is adjusted to 156Mvar, reserves controlled nargin 234Mvar; Controlled high resistance on the bus of Dunhuang is adjusted to 150Mvar, reserves controlled nargin 150Mvar; Dunhuang, Qaidam, Jiuquan, Sun-Moon Mountain, Hami, Hami are changed, Turfan transformer station all makes adjustment, and former mode and adopting considers that the adjustment contrast table of mode after the adjustment of system operation mode arrangement method under honourable fiery various energy resources complex environment is see table 1.After mode adjusts, again analyze the situation after eastern suburb-Turfan N-2 fault, after there is N-2 fault in eastern suburb-Turfan, the controlled high resistance of 234Mvar that husky state-fish card circuit reserves is dropped into, 150Mvar reserved on the bus of Dunhuang drops into, and the reactance in Dunhuang, Qaidam and Jiuquan transformer station all dropped into, result is see Fig. 3.
Table 1
D, Digital Simulation show, after there is N-2 fault in eastern suburb-Turfan circuit, connection is taked to throw after main transformer low anti-and circuit, bus high resistance and connection cut the measure of low appearance, 800kV bus is changed in Hami and 500kV bus, Qaidam 800kV bus and 330kV busbar voltage all drop to below 1.0p.u., can meet system cloud gray model requirement.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (11)
1. the defining method of power system operation mode under complicated energy environment, complicated energy environment is the environment that wind-powered electricity generation, photovoltaic and thermoelectricity have concurrently, it is characterized in that: said method comprising the steps of:
Step 1: the preliminary operational mode of generating power system, and determine busbar voltage control range;
Step 2: carry out single element safety and stability and calculate, and single element is assessed;
Step 3: the safety and stability of carrying out under catastrophe failure impact calculates, and determines final power system operation mode.
2. the defining method of power system operation mode under complicated energy environment according to claim 1, is characterized in that: described step 1 comprises the following steps:
Step 1 ?1: according to yearly load curve, load prediction and power system load capacity, determine large load power demands year maximum or Smaller load power demands year minimum value;
Step 1 ?2: according to respective installed capacity and the Regional Distribution of wind-powered electricity generation, photovoltaic, fired power generating unit in electric power system, the Seasonal Characteristics that combination is determined, generates various generating combination;
Step 1 ?3: according to the various generating combinations generated, calculate electric power system each section ability to transmit electricity limit;
Step 1 ?4: the difference of the lower electric power system each section ability to transmit electricity limit of the different generating combination of contrast, preferably reasonably generate electricity combination, the preliminary operational mode of generating power system;
Step 1 ?5: for generate the preliminary operational mode of electric power system, determine busbar voltage control range.
3. the defining method of power system operation mode under complicated energy environment according to claim 2, is characterized in that: in described step 1 ?2, and generating set comprises wind-powered electricity generation large originating party formula, photovoltaic large originating party formula or the large originating party formula of thermoelectricity.
4. the defining method of power system operation mode under complicated energy environment according to claim 2, it is characterized in that: described step 1 ?in 3, calculating electric power system each section ability to transmit electricity limit process is: the formation first determining section, progressively increases sending end start amount, reduces receiving end start amount; Then check N ?1 fault, until system unstability; Finally calculate the section ability to transmit electricity limit.
5. the defining method of power system operation mode under complicated energy environment according to claim 2, is characterized in that: in described step 1 ?4, according to generating set on the principle of ability to transmit electricity impact, preferably to generate electricity combination according to following standard;
1) each section ability to transmit electricity limit meet by step 1 ?load capacity in 1 and step 1 ?the determined each section of Regional Distribution in 2 send powered capacity requirement;
2) reduce influencing each other between each section ability to transmit electricity limit, when avoiding some section power transmission larger, cause other associated sections ability to transmit electricity limit significantly to decline.
6. the defining method of power system operation mode under complicated energy environment according to claim 2, it is characterized in that: described step 1 ?in 5, for the preliminary operational mode of electric power system generated, introducing power system safety and stability retrains, determine busbar voltage control range, realize ensureing the target of scope range of the fluctuation of voltage after power system safety and stability and pre-controlling fault;
Described power system safety and stability constraint refers to that power system operation mode meets the requirement of " power system stability directive/guide "; Busbar voltage control range refers to that busbar voltage meets the requirement of " power system voltage and var fire protection technology ".
7. the defining method of power system operation mode under complicated energy environment according to claim 2, is characterized in that: described step 2 comprises the following steps:
Step 2 ?1: according to generate the preliminary operational mode of electric power system, carry out single element safety and stability calculate, assess its whether meet power system safety and stability constraint; If meet, then proceed step 2 ?2; If do not meet, then return step 1 ?4;
Step 2 ?2: after judging single element fault, whether power system voltage level affects wind-powered electricity generation, the photovoltaic even stable operation of associated straight streaming system, and then causes cascading failure; If there is impact, then return step 1 ?5; If without impact, then perform step 3.
8. the defining method of power system operation mode under complicated energy environment according to claim 7, it is characterized in that: described step 2 ?in 1, assess single element whether to meet power system safety and stability constraint criteria and be: power system operation mode meets the requirement of " power system stability directive/guide ", after there is single element fault disturbance in the electric power system namely under normal operating mode, protection, switch and reclosing correct operation, do not take stability contorting measure, keep the normal power supply of power system stability operation and electric power system, other elements are no more than the accident overload ability of regulation, there is not successive trip.
9. the defining method of power system operation mode under complicated energy environment according to claim 7, it is characterized in that: described step 2 ?in 2, overvoltage or low voltage condition whether is there is after assessing single element fault according to evaluation criteria, after judging single element fault, whether power system voltage level affects the wind-powered electricity generation even stable operation of photovoltaic, and then causes cascading failure; Evaluation criteria is: if bus recovery voltage is increased to 1.1p.u. after single element fault, namely thinks and affects wind-powered electricity generation, photovoltaic generation stable operation; If bus voltage resume level is lower than 0.87p.u. after fault, namely thinks and affect direct current system stable operation.
10. the defining method of power system operation mode under complicated energy environment according to claim 2, it is characterized in that: in described step 3, the safety and stability of carrying out catastrophe failure according to the preliminary operational mode of electric power system calculates, the scale of assessment power system safety and stability control measure amount, is mainly the machine of cutting, cutting load measure amount; If security and stability control measurement amount cost is excessive, then return step 1 ?4; If security and stability control measurement amount can accept, be namely defined as final power system operation mode set.
The defining method of power system operation mode under 11. complicated energy environments according to claim 10, is characterized in that: described catastrophe failure comprises the permanent short circuit of electric power system main grid structure electric pressure joint use three-phase and jumps double back fault and direct current locking fault; According to " power system safety and stability control technology directive/guide " standard, if when electric power system generation catastrophe failure causes power system safety and stability to destroy, take to send end cutting machine or the measure of receiving end cutting load, prevent power system collapse, if electric power shifts or loss amount after security and stability control measurement amount exceedes catastrophe failure, think that security and stability control measurement amount cost is excessive, otherwise then think that security and stability control measurement amount can accept.
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