CN102651549B - Self-optimization multi-level voltage reactive power control method - Google Patents
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Abstract
The invention discloses a self-optimization multi-level voltage reactive power control method which aims at improving the percent of pass of network voltage. A multi-level compensating controller is in communication connection with a transformer substation, a line, a distribution room three-level reactive compensation device and a voltage monitoring terminal which can be automatically controlled according to a nine-zone diagram manner, a nine-zone diagram lower limit voltage value of the reactive compensation device can be adjusted in an increment manner by using a dynamic self-optimization multi-level control method, and the utilization rate of a compensation capacitor can be further improved, as each level reactive compensation device is supported and compensated nearby, so that the condition that the low voltage of a whole network can be minimum is realized. As the reactive power control can be carried out on the voltage of the whole network by using the method, the cost is low, the effect is direct, the implement is easy, and the problems that remained resources of the whole network reactive compensation device can not be utilized automatically, the line loss can not be reduced, and the percent of pass of the voltage is low can be solved.
Description
Technical field
The invention belongs to electric network reactive compensation field, relate to reactive compensation method for countryside electric network, particularly a kind of from optimizing multilevel voltage powerless control method.
Technical background
Present stage, China's rural power grids primary structure was: take 110kV/10kV or 66kV/10kV transformer station is power supply, by 10kV high-tension line, electric energy is delivered to 10kV/0.4kV and becomes radio area, by distribution transformer and low-voltage circuit, by electric energy, gives terminal use.Rural power grids have following feature:
1, load, circuit is longer, and terminal temperature difference voltage is low;
2, the seasonality of load is strong, duty ratio during busy farming season during slack season large tens times;
In recent years the development of building along with rural power grids reactive power compensation, rural power grids have formed following three grades of reactive-load compensation methods:
1, transformer station's centralized compensation: concentrate reactive power compensator at 66kV or the 10kV of 110kV transformer station side configuration electric capacity, compensation capacity is generally 15% ~ 30% of main transformer capacity, is generally a group or two groups, manually or automatically switching.By electric capacity centralized compensation, provide 10kV exit required idle, guarantee that 10kV side outlet place voltage is at acceptability limit.
2,10kV circuit centralized compensation: lumped capacitance compensation arrangement is installed on 10kV ultra-high-tension power transmission line, and compensation capacity is generally 100 ~ 600kavr, selects one to two point to install conventionally on a 10kV circuit.By line build-out, can reduce the voltage drop of circuit.
3, platform district dispersion compensation: in 10kV power distribution station, 0.4kV side is installed automatic reactive compensator, and capacity is generally 10% ~ 20% of capacity of distribution transform.According to 0.4kV exit, platform district load, automatically compensate, improve 0.4kV side outlet voltage.
The problem that rural power grids reactive power compensation at present exists is: reactive power compensators at different levels all be take local reactive power compensation resource, this ground voltage as controlling target, and mutually do not support between compensation arrangement at different levels, can not make full use of the idle resource of the whole network.Often occur, end station district reactive power compensator all drops into and outlet voltage is still low; Higher level's circuit and transformer station still have residue idle.Form that the whole network is idle residue, and local voltage situation on the low side, the whole network resource is not fully utilized.
Summary of the invention
A kind of multilevel voltage powerless control method that utilizes the idle resource automatic optimal of the whole network is provided, reduce to greatest extent line loss and improve the whole network rate of qualified voltage, be applicable to the particularly unified management of the following three grades of reactive-load compensation equipments of Rural Power Distribution Network transformer station of China's power distribution network.
The technical scheme adopting is:
1, from optimizing multilevel voltage powerless control method, it is characterized in that:
(1) in Yi Ge transformer station and following many 10KV distribution lines, from optimizing multilevel voltage powerless control system, configure as follows:
A Multilevel compensating controller of ① transformer station installing, in transformer station, 10KV side is installed one or more Reactive Power Compensation Eqyuipment in Substations, on each 10KV distribution line, install 0 to 2 reactive power compensation system device, in the 0.4kV side of each 10KV distribution line platform district transformer, install 1 Ge Tai district reactive power compensator, in the 0.4kV side supply line that sets Tai district transformer, install voltage monitoring terminal;
2. Multilevel compensating controller is connected and both-way communication by fieldbus with Reactive Power Compensation Eqyuipment in Substation, Multilevel compensating controller and reactive power compensation system device, platform district reactive power compensator and distribution voltage monitoring terminal connect and both-way communication by wireless telecommunications;
3. Reactive Power Compensation Eqyuipment in Substation, reactive power compensation system device, platform district reactive power compensator is according to nine district figure control strategies and carries out the reactive power compensator that voltage power-less is controlled automatically, and the increment type of accepting Multilevel compensating controller Dui Jiu district figure lower voltage limit threshold value is revised, the differential of increment is the Z% of rated voltage, Z=0.1 to 1.5;
4. Multilevel compensating controller gathers each Reactive Power Compensation Eqyuipment in Substation by communication modes, reactive power compensation system device, platform district reactive power compensator, the equipment operational factor at distribution voltage monitoring terminal place and the voltage of power grid quality parameter, particularly electrical network;
(2) Multilevel compensating controller is revised each reactive power compensator nine district figure by following method and is controlled lower voltage limit threshold value, the minimum multistage self-optimizing control turning to of lower voltage rate that realizes the following monitoring point of whole transformer station:
1. Multilevel compensating controller gathers Reactive Power Compensation Eqyuipment in Substation, reactive power compensation system device, and platform district reactive power compensator, the voltage data that distribution voltage monitoring terminal place detects, relatively whether the voltage of these monitoring points is lower than the qualified voltage lower limit of setting;
2. Multilevel compensating controller is according to supporting compensation nearby and avoiding the principle of concussion that the cycle of adjusting idle compensating control nine district figure lower voltage limit threshold values at different levels is divided into three periods, T1, T2 and T3, T1=A*T2 wherein, T2=B*T3, T3 equaled between 5 to 50 hours, A=5, B=7, T1 is Substation Reactive-power Compensation controller adjustment cycle, T2 is reactive power compensation system controller adjustment cycle, T3Wei Tai district reactive power compensation adjustment cycle;
3. the lower voltage rate K that Multilevel compensating controller statistics is stood entirely
lOW, the lower voltage rate K of each sub power distribution branch line
i, i=1 is to N, and N=transformer station distribution line divides number; Wherein:
K
LOW=K
ltal/K
tal
Wherein: K
ltalfor all detecting the more lower limit number of data in previous adjustment cycle;
K
talfor all detecting data amount check in previous adjustment cycle;
K
i=K
ltali/K
tali
Wherein: K
ltaliit is the more lower limit number that all detects data in the previous adjustment cycle of i bar distribution line;
K
talibe in the previous adjustment cycle of i bar distribution line, all to detect data amount check;
4. first order Self-Optimizing Control Approach is: Multilevel compensating controller is divided into N period by the distribution wire way N of transformer station T3, when each period finishes, successively all district's reactive power compensators of each distribution branch nine district figure lower voltage limit threshold values are done to one-level increment type rolling optimization and regulate, so that lower voltage rate is tending towards minimum; Note is the K of statistics last time
ifor K
a, the K of this statistics
ifor K
b, the direction of modification is determined according to following rule: when this lower voltage rate is not less than last time lower voltage rate, do not change the direction of increment,, when Kb≤Ka, increment direction is constant, when Kb ≮ Ka, and the change of increment direction;
5. second level Self-Optimizing Control Approach is: Multilevel compensating controller divides number N that T2 is divided into N period by transformer station's distribution line, when each period finishes, successively all reactive power compensation system device nine district figure lower voltage limit threshold values of each distribution branch being done to an increment type rolling optimization regulates, lower voltage limit threshold values increases or reduces the Z% of rated voltage, so that lower voltage rate is tending towards minimum; Note is the K of statistics last time
ifor K
c, the K of this statistics
ifor K
d, the direction that lower voltage limit threshold values is revised is determined according to following rule: when this lower voltage rate is less than or equal to last time lower voltage rate, voltage increment direction is constant, works as K
d≤ K
ctime, increment direction is constant, works as K
d≮ K
ctime, increment direction changes;
6. third level Self-Optimizing Control Approach is: Multilevel compensating controller is done an increment type rolling optimization every the T1 time to Reactive Power Compensation Eqyuipment in Substation nine district figure lower voltage limit threshold values and regulated, so that lower voltage rate is tending towards minimum; Note is the K of statistics last time
lOWfor K
l1, the K of this statistics
lOWfor K
l0, the direction of modification is determined according to following rule: when this lower voltage rate is less than or equal to last time lower voltage rate, voltage increment direction is constant, works as K
l0≤ K
l1time, increment direction is constant, works as K
l0≮ K
l1time, increment direction changes;
2, for original Reactive Power Compensation Eqyuipment in Substation, reactive power compensation system device, platform district reactive power compensator does not support increment type to revise nine district figure lower voltage limit threshold values, but support the situation that direct parameter is revised, Multilevel compensating controller calculates the increment of each reactive power compensator, the mode of revising with direct parameter, revises Qi Jiu district figure lower voltage limit threshold value.
3, Multilevel compensating controller is by man-machine interface and communication interface, to the lower voltage rate K at administrative staff and the full station of host computer transmission
lOWdata.
4, Multilevel compensating controller, by man-machine interface and communication interface, is accepted the Z that administrative staff and host computer are assigned, T1, and T2, T3, A, the parameters such as B, to realize the optimization of further human intervention.
According to the idle controlling party of multilevel voltage of utilizing the idle resource automatic optimal of the whole network to control provided by the invention
Method, change reactive power compensators at different levels and all take the idle resource in this locality, this ground voltage as controlling target, and mutually do not support between compensation arrangements at different levels, can not make full use of the situation of the idle resource of the whole network, solved the surplus resources that cannot automatically utilize the whole network reactive power compensator, further reduce line loss, improve the problem of rate of qualified voltage.
According to this method, carry out the whole network idle work optimization, cost is low, and effect is direct, be easy to realize, only need configuration Multilevel compensating controller, and with three grades of reactive power compensator communications, just can realize the idle control of multilevel voltage that the whole network automatic optimal is controlled, improve and maintenance the whole network rate of qualified voltage.
Accompanying drawing explanation
Fig. 1 is a kind of example structure schematic diagram of the present invention.
Embodiment
From an optimizing multilevel voltage powerless control method, take a typical transformer station and following power distribution network is example.Configure a Multilevel compensating controller, lower voltage limit to reactive power compensators at different levels regulates, and reactive power compensators at different levels, at any time according to new voltage adjusting range, are optimized adjusting to idle the making in this locality, make that the whole network is idle is fully used, reduce the whole network lower voltage rate.
The whole network configuration: there are 2 10kV distribution lines in 66kV/10kV transformer station.At the B1 of transformer station, Reactive Power Compensation Eqyuipment in Substation B2 and Multilevel compensating controller B3 are installed.
Article one, on 10KV distribution line X1, be separately installed with line building-out unit X11, platform district reactive power compensator X12, platform district reactive power compensator X13, platform district reactive power compensator X14 and low voltage monitoring device X15.
On second 10KV distribution line X2, be separately installed with line building-out unit X21, line building-out unit X22, platform district reactive power compensator X23, platform district reactive power compensator X24, platform district reactive power compensator X25 and low voltage monitoring device X26.
The Reactive Power Compensation Eqyuipment in Substation B2 that Multilevel compensating controller B3 arranges by 485 communication interface Yu Gai transformer stations, by wireless public network, with circuit He Tai district's reactive power compensator and low-voltage monitoring device, carry out communication, realize the information that receives reactive power compensators at different levels and low-voltage monitoring terminal and the communication function of sending out lower voltage limit threshold values.
Establish self-optimizing control parameter A=5 to Multilevel compensating controller B3, B=7, T3=12, T2=84, T1=420, distribution wire way N=2, T3/N=6, set every 6 hours Multilevel compensating controller Dui Tai district reactive power compensator lower voltage limit threshold values and once adjust, T2/N=42, set and every 42 hours Multilevel compensating controllers, reactive power compensation system device lower voltage limit threshold values is once adjusted, every 420 hours, Multilevel compensating controller was once adjusted Reactive Power Compensation Eqyuipment in Substation lower voltage limit threshold values.
Establish the differential parameter Z %=1% of increment to Multilevel compensating controller B3.
Transformer station, circuit, platform district reactive power compensator nine district figure voltage power-less arrange as following table:
Certain constantly, reactive power compensators at different levels all reach adjusts voltage that time each reactive power compensator and the low-voltage monitoring device of lower voltage limit threshold values collect and idle situation as following table:
At this moment, the voltage at reactive power compensator X14 place, platform district and the first low-voltage monitoring device X15 place is respectively 0.378(KV) and 0.36 (KV), lower than qualified voltage lower limit 0.38 (KV), get over lower limit.The whole network voltage of statistics
Qualification rate K
lOW=99.4%.
Multilevel compensating controller B3 adjusts by following strategy successively.
(1), platform district reactive power compensator X12 place: this lower voltage rate of lower voltage rate ka=1%> kb=0.8% last time, last time strategy was for boosting, this maintains the strategy that boosts, and adjusting X12 lower voltage limit threshold values increases rated voltage 1%, i.e. 0.388+1%*0.4=0.392;
Reactive power compensator X13 place, platform district: lower voltage rate k last time
athis lower voltage rate of=0.8%< k
b=0.9%, last time strategy was for boosting, and this changes step-down strategy into, adjusted X13 lower voltage limit threshold values and reduced rated voltage 1%, i.e. 0.396-1%*0.4=0.392;
Reactive power compensator X14 place, platform district: lower voltage rate k last time
athis lower voltage rate of=1.1%> k
b=0.9%, last time strategy was for boosting, and this changes step-down strategy into, and adjusting X14 lower voltage limit threshold values increases rated voltage 1%, i.e. 0.388+1%*0.4=0.392;
Line building-out unit X11 place: this lower voltage rate kd=0.6%< is lower voltage rate kc=0.7% last time, last time strategy was for boosting, and this maintains the strategy that boosts, and adjusting X11 lower voltage limit threshold values increases rated voltage 1%, i.e. 10.1+10*0.01=10.2;
Reactive power compensator X23 place, platform district, last time lower voltage rate k
athis lower voltage rate of=0.6%< k
b=0.8%, last time strategy was for boosting, and this changes step-down strategy into, adjusted X23 lower voltage limit threshold values and reduced rated voltage 1%, i.e. 0.396-1%*0.4=0.392;
Reactive power compensator X24 place, platform district, last time lower voltage rate k
athis lower voltage rate of=0.7%< k
b=0.8%, last time strategy was for boosting, and this changes step-down strategy into, adjusted X24 lower voltage limit threshold values and reduced rated voltage 1%, i.e. 0.396-1%*0.4=0.392;
Reactive power compensator X25 place, platform district, last time lower voltage rate k
athis lower voltage rate of=0.7%< k
b=0.8%, last time strategy was for boosting, and this maintains the strategy that boosts, and adjusting X25 lower voltage limit threshold values increases rated voltage 1%, i.e. 0.388+1%*0.4=0.392;
Line building-out unit X21 place: this lower voltage rate kd=0.5%< is lower voltage rate kc=0.7% last time, last time strategy was for boosting, and this maintains the strategy that boosts, and adjusting X21 lower voltage limit threshold values increases rated voltage 1%, i.e. 10.1+10*0.01=10.2;
Line building-out unit X22 place: this lower voltage rate kd=0.65%< is lower voltage rate kc=0.8% last time, last time strategy was for boosting, this maintains the strategy that boosts, and adjusting X22 lower voltage limit threshold values increases rated voltage 1%, i.e. 10.1+10*0.01=10.2;
Reactive Power Compensation Eqyuipment in Substation B2 place: this lower voltage rate k
l0=0.6%< is lower voltage rate k last time
l1=0.75%, last time strategy was for boosting, and this maintains the strategy that boosts, and adjusting B2 lower voltage limit threshold values increases rated voltage 1%,
10.1+10*0.01=10.2；
After adjustment, the voltage that compensation arrangements at different levels and voltage monitoring terminal collect and idle situation are as following table:
By above adjusting, reactive power compensator X13 place, platform district voltage raises, no longer more lower limit; The voltage at low voltage monitoring device X15 place has rising.The whole network rate of qualified voltage of statistics, by original 99.4%, brings up to 99.5%.
Native system is idle according to the whole network and the variation of voltage, on the basis of reactive power compensator auto-controls at different levels, Multilevel compensating controller is according to the regulation and control situation of the voltage of the whole network and each branch, idle and reactive power compensator, increment type regulates each reactive power compensator Jiu district figure lower voltage limit threshold value step by step, make the whole network lower voltage rate step-down gradually, and dynamically follow the tracks of self-optimizing adjustment, and it is idle that realization makes full use of the whole network, and keeping the whole network rate of qualified voltage is the highest target.Be applicable to the particularly unified management of the following three grades of reactive-load compensation equipments of Rural Power Distribution Network transformer station of China's power distribution network.
Claims (4)
1. from optimizing multilevel voltage powerless control method, it is characterized in that:
(1) in Yi Ge transformer station and following many 10KV distribution lines, from optimizing multilevel voltage powerless control system, configure as follows:
A Multilevel compensating controller of ① transformer station installing, in transformer station, 10KV side is installed one or more Reactive Power Compensation Eqyuipment in Substations, on each 10KV distribution line, install 0 to 2 reactive power compensation system device, in the 0.4kV side of each 10KV distribution line platform district transformer, install 1 Ge Tai district reactive power compensator, in the 0.4kV side supply line that sets Tai district transformer, install voltage monitoring terminal;
2. Multilevel compensating controller is connected and both-way communication by fieldbus with Reactive Power Compensation Eqyuipment in Substation, Multilevel compensating controller and reactive power compensation system device, and platform district reactive power compensator and voltage monitoring terminal connect and both-way communication by wireless telecommunications;
3. Reactive Power Compensation Eqyuipment in Substation, reactive power compensation system device, platform district reactive power compensator is according to nine district figure control strategies and carries out the reactive power compensator that voltage power-less is controlled automatically, and the increment type of accepting Multilevel compensating controller Dui Jiu district figure lower voltage limit threshold value is revised, the differential of increment is the Z% of rated voltage, Z=0.1 to 1.5;
4. Multilevel compensating controller gathers each Reactive Power Compensation Eqyuipment in Substation by communication modes, reactive power compensation system device, platform district reactive power compensator, the equipment operational factor of voltage monitoring end and power grid quality parameter, wherein power grid quality parameter refers to the voltage of electrical network;
(2) Multilevel compensating controller is revised each Reactive Power Compensation Eqyuipment in Substation by following method, reactive power compensation system device, platform district reactive power compensator Jiu district figure controls lower voltage limit threshold value, realizes the control of minimumization of lower voltage rate of the following monitoring point of whole transformer station:
1. Multilevel compensating controller gathers Reactive Power Compensation Eqyuipment in Substation, reactive power compensation system device, and platform district reactive power compensator, the voltage data that voltage monitoring end detects, relatively whether the voltage of these monitoring points is lower than the qualified voltage lower limit of setting;
2. Multilevel compensating controller is according to supporting compensation nearby and avoiding the principle of concussion that the cycle of adjusting idle compensating control nine district figure lower voltage limit threshold values at different levels is divided into three periods, idle compensating controls at different levels refer to Reactive Power Compensation Eqyuipment in Substation, reactive power compensation system device, platform district reactive power compensator; T1, T2 and T3, T1=A*T2 wherein, T2=B*T3, T3 equaled between 5 to 50 hours, A=5, B=7, T1 is Reactive Power Compensation Eqyuipment in Substation adjustment cycle, T2 is reactive power compensation system device adjustment cycle, T3Wei Tai district reactive power compensation adjustment cycle;
3. the lower voltage rate K that Multilevel compensating controller statistics is stood entirely
lOW, the lower voltage rate K of each sub power distribution branch line
i, i=1 is to N, and N=transformer station distribution line divides number; Wherein:
K
LOW=K
ltal/K
tal
Wherein: K
ltalfor all detecting the more lower limit number of data in previous adjustment cycle;
K
talfor all detecting data amount check in previous adjustment cycle;
K
i=K
ltali/K
tali
Wherein: K
ltaliit is the more lower limit number that all detects data in the previous adjustment cycle of i bar distribution line;
K
talibe in the previous adjustment cycle of i bar distribution line, all to detect data amount check;
4. first order Self-Optimizing Control Approach is: Multilevel compensating controller is divided into N period by the distribution wire way N of transformer station T3, when each period finishes, successively all district's reactive power compensators of each distribution branch nine district figure lower voltage limit threshold values are done to one-level increment type rolling optimization and regulate, so that lower voltage rate is tending towards minimum; Note is the K of statistics last time
ifor K
a, the K of this statistics
ifor K
b, the direction of modification is determined according to following rule: when this lower voltage rate is not less than last time lower voltage rate, do not change the direction of increment,, when Kb≤Ka, increment direction is constant, when Kb ≮ Ka, and the change of increment direction;
5. second level Self-Optimizing Control Approach is: Multilevel compensating controller divides number N that T2 is divided into N period by transformer station's distribution line, when each period finishes, successively all reactive power compensation system device nine district figure lower voltage limit threshold values of each distribution branch being done to an increment type rolling optimization regulates, lower voltage limit threshold values increases or reduces the Z% of rated voltage, so that lower voltage rate is tending towards minimum; Note is the K of statistics last time
ifor K
c, the K of this statistics
ifor K
d, the direction that lower voltage limit threshold values is revised is determined according to following rule: when this lower voltage rate is less than or equal to last time lower voltage rate, voltage increment direction is constant, works as K
d≤ K
ctime, increment direction is constant, works as K
d≮ K
ctime, increment direction changes;
6. third level Self-Optimizing Control Approach is: Multilevel compensating controller is done an increment type rolling optimization every the T1 time to Reactive Power Compensation Eqyuipment in Substation nine district figure lower voltage limit threshold values and regulated, so that lower voltage rate is tending towards minimum; Note is the K of statistics last time
lOWfor K
l1, the K of this statistics
lOWfor K
l0, the direction of modification is determined according to following rule: when this lower voltage rate is less than or equal to last time lower voltage rate, voltage increment direction is constant, works as K
l0≤ K
l1time, increment direction is constant, works as K
l0≮ K
l1time, increment direction changes.
2. according to claim 1 from optimizing multilevel voltage powerless control method, it is characterized in that: for original Reactive Power Compensation Eqyuipment in Substation, reactive power compensation system device, platform district reactive power compensator does not support increment type to revise nine district figure lower voltage limit threshold values, but support the situation that direct parameter is revised, Multilevel compensating controller calculates the increment of each reactive power compensator, and the mode of revising with direct parameter is revised Qi Jiu district figure lower voltage limit threshold value.
3. according to claim 1 from optimizing multilevel voltage powerless control method, it is characterized in that: Multilevel compensating controller is by man-machine interface and communication interface, to the lower voltage rate K at administrative staff and the full station of host computer transmission
lOWdata.
4. according to claim 1 from optimizing multilevel voltage powerless control method, it is characterized in that: Multilevel compensating controller is by man-machine interface and communication interface, accept administrative staff and host computer is assigned Z, T1, T2, T3, A, B parameter, to realize the optimization of further human intervention.
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| CN101414752A (en) * | 2007-10-19 | 2009-04-22 | 上海润育电气安装有限公司 | Closed-cycle control system for reactive automatic optimization of network-configuring voltage |
| CN201435609Y (en) * | 2009-07-03 | 2010-03-31 | 上海追日电气有限公司 | Constant-volume adjustable reactive power compensation device |
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| CN101127442A (en) * | 2007-06-22 | 2008-02-20 | 泰州苏源科电有限公司 | Control method and system for 10kV and lower distribution grid no power voltage optimized operation |
| CN101414752A (en) * | 2007-10-19 | 2009-04-22 | 上海润育电气安装有限公司 | Closed-cycle control system for reactive automatic optimization of network-configuring voltage |
| CN201435609Y (en) * | 2009-07-03 | 2010-03-31 | 上海追日电气有限公司 | Constant-volume adjustable reactive power compensation device |
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