Voltage security based on synchro measure information stablizes self adaptation emergency control method
Technical field
The invention belongs to operation and control of electric power system field, the present invention relates to a kind of voltage security based on synchro measure information more precisely and stablize self adaptation emergency control method.
Background technology
The long-distance sand transport of extensive electric power, load center voltage support scarce capacity make stable the becoming in operation and control of electric power system of voltage security need one of key problems-solving.Existing voltage security is stablized emergency control technology and is comprised two classes, and a class is the emergency control based on pre-establishing control scheme list, such as Local Safety and Stability Control System; This kind of technology real-time and control precision higher, but no matter be control by off-line strategy table, or control by strategy of on-line table, be all difficult to avoid the mistake control problem brought because the operational mode for analyzing is excessive with the difference of actual motion state and deficient control problem, reliability is not high.Another kind of is emergency control based on In situ Measurement real time information, such as low-voltage load sheding; Such engineering reliability and real-time higher, but measure on the spot owing to only having, its control precision is difficult to ensure.
Summary of the invention
The object of the invention is: the reliability stablizing emergency control in order to comprehensively improve voltage security, real-time and precision, the present invention proposes only based on busbar voltage and the Branch Power Flow synchro measure data of the load center transformer station collected in real time, do not rely on the operational mode of other plant stand of electric power system, do not rely on electric power system model and parameter, directly set up reflection busbar voltage variable quantity and each bus load is gained merit and tie-in equation between idle work variable quantity, according to each bus load gain merit and the idle sensitivity to busbar voltage change little characteristic at short notice, the equation group of incidence relation between multiple operating points of employing optimization method simultaneous solution reflection actual measurement running orbit, obtain each bus load to gain merit and the idle sensitivity to busbar voltage, again based on sensitivity, consideration can control means and priority thereof and cost, and the voltage security stability requirement of each bus, realize preventing voltage from losing the coordination optimization emergency control of safety and stability.。
Specifically, the present invention adopts following technical scheme to realize, and comprises the following steps:
1) the voltage security stability monitoring equipment collected based on synchro measure concentrates voltage and the Branch Power Flow information of all buses, and by the samples storage cycle T of setting
_{0}store these information, obtain comprising up-to-date synchro measure moment t
_{0}information, in interior actual measurement historical information, enters step 2);
2) if the t collected
_{0}the voltage security stability monitoring equipment in moment is concentrated the voltage of all buses to be more than or equal to respective bus bars voltage-controlled calculating enabling gate threshold value all respectively or wherein has at least the voltage of 1 bus to be less than or equal to the malfunction threshold value of respective bus bars voltage, then return step 1); If the t collected
_{0}the voltage security stability monitoring equipment in moment concentrates the voltage of all buses be more than or equal to the emergency control enabling gate threshold value of respective bus bars voltage all respectively and wherein have at least the voltage of 1 bus to be less than respective bus bars voltage-controlled calculating enabling gate threshold value, then enter step 3); If the t collected
_{0}the voltage security stability monitoring equipment in moment concentrates the voltage of all buses be greater than the malfunction threshold value of respective bus bars voltage all respectively and wherein have at least the voltage of 1 bus to be less than the emergency control enabling gate threshold value of respective bus bars voltage, the bus then voltage being less than the emergency control enabling gate threshold value of respective bus bars voltage filters out, form voltage bus collection to be controlled, enter step 8);
The calculating enabling gate threshold value that described busbar voltage controls is greater than the emergency control enabling gate threshold value of respective bus bars voltage, the emergency control enabling gate threshold value of busbar voltage is greater than the safety and stability critical value of respective bus bars voltage, and the safety and stability critical value of busbar voltage is greater than the malfunction threshold value of respective bus bars voltage;
3) if the sensitivity calculations sampling period T of the time span T corresponding to actual measurement historical information collected and setting
_{s}ratio be less than 4, then return step 1), otherwise by t
_{0}moment as the 1st sampling instant point, with T
_{s}actual measurement historical information is sampled, makes the 2nd sampling instant point be t
_{0}-T
_{s}in the moment, the 3rd sampling instant point is t
_{0}-2T
_{s}in the moment, the 4th sampling instant point is t
_{0}-3T
_{s}in the moment, the 5th sampling instant point is t
_{0}-4T
_{s}in the moment, enter step 4);
Wherein, T
_{s}be set to the samples storage cycle T of surveying historical information
_{0}integral multiple;
4) based on busbar voltage and the Branch Power Flow synchro measure information of adjacent two sampling instant points, set up the voltage variety of each bus between reflection two sampling instant points, load gains merit the total idle work variable quantity of variable quantity, load and reactive-load compensation equipment and each bus injects the meritorious sensitivity to busbar voltage, inject the tie-in equation group that the idle sensitivity to busbar voltage and electrical network other factors cause the variable quantity of busbar voltage, each bus injected the meritorious sensitivity to busbar voltage and inject the idle sensitivity to busbar voltage, and at T
_{s}in interior electrical network, other factors causes the variable quantity of busbar voltage as variable, and hypothesis is in the tie-in equation group of different two neighbouring sample moment point, these variablees are identical, the tie-in equation group of relation between two the sampling instant point running statuses adopting optimization method simultaneous solution 4 reflection adjacent; If have optimal solution and be unique solution, then using the most new explanation of optimal solution as corresponding variable, and by t
_{0}moment is as the moment t associated by most new explanation
_{r}, enter step 5), otherwise, enter step 5);
5) if each bus injects the meritorious sensitivity to busbar voltage and injects the idle sensitivity to busbar voltage, and at T
_{s}in interior electrical network, other factors causes the solution of the variable quantity of busbar voltage to obtain and t
_{0}-t
_{r}be less than or equal to the sensitivity effective time of setting, then the t will collected
_{0}the bus that in all buses in moment, voltage is less than the decision-premaking control gate threshold value of respective bus bars voltage filters out, form voltage decision-premaking control bus collection, for the situation of voltage decision-premaking control bus collection non-NULL, enter step 6), for the situation that voltage decision-premaking control bus collection is empty, return step 1);
Otherwise, return step 1);
The decision-premaking control gate threshold value of described busbar voltage is greater than the emergency control enabling gate threshold value of respective bus bars voltage;
6) bus is injected the meritorious bus that setting is greater than to the sensitivity of busbar voltage and inject the meritorious sensitivity threshold value to busbar voltage and controlled bus load filters out, form bus load control measure collection, bus is injected bus that the idle sensitivity to busbar voltage is greater than setting to inject the idle sensitivity threshold value to busbar voltage and controlled bus load and filter out, join bus load control measure collection, bus is injected bus that the idle sensitivity to busbar voltage is greater than setting and inject the idle sensitivity threshold value to busbar voltage and resectable bus shunt reactor and the bus shunt capacitor that can drop into filters out, form bus reactive-load compensation equipment control measure collection, if bus load control measure collection non-NULL or bus reactive-load compensation equipment control measure collection non-NULL, enter step 7), otherwise, return step 1),
Described controlled bus load refers to the controlled load branch circuit being connected to this bus;
7) set up with the control Least-cost of cutting load as target function, consider the control priority of different cutting load measure, meritorious and idle in load transfer and cutting load measure is one, and load transfer, meeting voltage decision-premaking control bus after reactive-load compensation equipment is moved back in cutting load and throwing concentrates the increment of each busbar voltage to be more than or equal to 01 integer programming model of the constraints of the emergency control enabling gate threshold value of respective bus bars voltage and the difference of its voltage security Critical Stability value, the measure of calculating voltage safety and stability decision-premaking emergency control is carried out by solving 01 integer programming model,
If can optimal solution be obtained, then the load transfer measure corresponding to wherein arbitrary optimal solution, cutting load measure are moved back reactive-load compensation equipment measure as up-to-date voltage security stability pre_decision emergency control measure with throwing, and by voltage decision-premaking control bus collection and t
_{0}moment is as the voltage decision-premaking control bus collection associated by up-to-date voltage security stability pre_decision emergency control measure and moment t
_{c}, then return step 1), otherwise return step 1);
8) if up-to-date voltage security stability pre_decision emergency control measure has obtained and t
_{0}-t
_{c}be less than or equal to the effective time of the decision-premaking emergency control measure of setting, then for the situation of the common factor non-NULL of the voltage decision-premaking control bus collection associated by up-to-date voltage security stability pre_decision emergency control measure and voltage bus collection to be controlled, up-to-date voltage security stability pre_decision emergency control measure is directly implemented, return step 1), common factor for the voltage decision-premaking control bus collection associated by up-to-date voltage security stability pre_decision emergency control measure and voltage bus collection to be controlled is the situation of empty set, returns step 1); Otherwise, return step 1).
Technique scheme is further characterized in that, represent from the 1st sampling instant point respectively by equation group (1)-(4) in step 4), the gain merit total idle work variable quantity of variable quantity, load and reactive-load compensation equipment and each bus of the voltage variety of each bus between 2 adjacent sampling instant points, load injects the meritorious sensitivity to busbar voltage, injects the relation that the idle sensitivity to busbar voltage and electrical network other factors cause the variable quantity of busbar voltage, and meritorious, idle is just all to flow into bus:
$\begin{array}{c}{v}_{0.i}-{v}_{1.i}=\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{0.j}-{P}_{1.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{0.j}-{Q}_{1.j})]\\ +\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{0.j}-{Q}_{1.j})\right]+\mathrm{\Δ}{V}_{i}i=\mathrm{1,2},\·\·\·,n\end{array}---\left(1\right)$
$\begin{array}{c}{v}_{1.i}-{v}_{2.i}=\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{1.j}-{P}_{2.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{1.j}-{Q}_{2.j})]\\ +\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{1.j}-{Q}_{2.j})\right]+\mathrm{\Δ}{V}_{i}i=\mathrm{1,2},\·\·\·,n\end{array}---\left(2\right)$
$\begin{array}{c}{v}_{2.i}-{v}_{3.i}=\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{2.j}-{P}_{3.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{2.j}-{Q}_{3.j})]\\ +\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{2.j}-{Q}_{3.j})\right]+\mathrm{\Δ}{V}_{i}i=\mathrm{1,2},\·\·\·,n\end{array}---\left(3\right)$
$\begin{array}{c}{v}_{3.i}-{v}_{4.i}=\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{3.j}-{P}_{4.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{3.j}-{Q}_{4.j})]\\ +\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{3.j}-{Q}_{4.j})\right]+\mathrm{\Δ}{V}_{i}i=\mathrm{1,2},\·\·\·,n\end{array}---\left(4\right)$
Wherein, n is the number of the synchro measure information median generatrix of voltage, m is the number of the synchro measure information median generatrix of load, M is the number of idle synchro measure information median generatrix, before solving equation group (1)-(4), to need the bus bar of loads all in synchro measure information, above, there is no load, only have the bus bar of reactive-load compensation equipment later, v
_{0.i}, v
_{1.i}, v
_{2.i}, v
_{3.i}and v
_{4.i}be respectively the voltage that the 1st to the 5th sampling instant point voltage monitoring safety and stability equipment concentrates i-th bus, λ
_{p.i.j}, λ
_{q.i.j}being respectively voltage security stability monitoring equipment concentrates the injection of a jth bus gain merit to the sensitivity of i-th busbar voltage and inject the idle sensitivity to i-th busbar voltage, P
_{0.j}, P
_{1.j}, P
_{2.j}, P
_{3.j}and P
_{4.j}being respectively the 1st to the 5th sampling instant point voltage monitoring safety and stability equipment concentrates the total of load in a jth bus synchro measure information to gain merit, Q
_{0.j}, Q
_{1.j}, Q
_{2.j}, Q
_{3.j}and Q
_{4.j}be respectively the 1st to the 5th sampling instant point voltage monitoring safety and stability equipment and concentrate the always idle of load and reactive-load compensation equipment in a jth bus synchro measure information, Δ V
_{i}for other factors in electrical network causes voltage security stability monitoring equipment to concentrate the variable quantity of i-th busbar voltage;
λ is calculated by Optimization Method formula (5)
_{p.i.j}, λ
_{q.i.j}with Δ V
_{i}:
$\begin{array}{c}\mathrm{min}{\left\{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\right\{({v}_{0.i}-{v}_{1.i})-\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{0.j}-{P}_{1.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{0.j}-{Q}_{1.j})]-\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{0.j}-{Q}_{1.j})\right]-\mathrm{\Δ}{V}_{i}\}}^{2}\\ {+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\{({v}_{1.i}-{v}_{2.i})-\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{1.j}-{P}_{2.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{1.j}-{Q}_{2.j})]-\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{Q.i.j}({Q}_{1.j}-{Q}_{2.J})]-\mathrm{\Δ}{V}_{i}\}}^{2}\\ +\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\{({v}_{2.i}-{v}_{3.i})-\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{2.j}-{P}_{3.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{2.j}-{Q}_{3.j})]-\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{Q.i.j}({Q}_{2.j}-{Q}_{3.j})]-\mathrm{\Δ}{V}_{i}\}}^{2}\\ +\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\{({v}_{3.i}-{v}_{4.i})-\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{3.j}-{P}_{4.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{3.j}-{Q}_{4.j})]-\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{Q.i.j}({Q}_{3.j}-{Q}_{4.j})]-\mathrm{\Δ}{V}_{i}\}}^{2}\end{array}---\left(5\right).$
Technique scheme is further characterized in that, in step 7), represent that target function, with the formula (7) represent 01 integer programming model of constraints by solving with the formula (6), carry out the measure of calculating voltage safety and stability decision-premaking emergency control, meritorious, idle is just all to flow into bus:
$\mathrm{min}\left(\underset{r=1}{\overset{R}{\mathrm{\Σ}}}\underset{d=1}{\overset{{D}_{r}}{\mathrm{\Σ}}}(-{P}_{E.r.0.d}{C}_{r.0.d}{x}_{r.d})\right)---\left(6\right)$
$\left\{\begin{array}{c}\underset{r=1}{\overset{R}{\mathrm{\Σ}}}\underset{d=1}{\overset{{D}_{r}}{\mathrm{\Σ}}}\left[({\mathrm{\λ}}_{P.k.{k}_{0}}{P}_{E.r.0.d}+{\mathrm{\λ}}_{Q.k.{k}_{0}}{Q}_{E.r.0.d}){x}_{r.d}\right]\\ +\underset{l}{\overset{L}{\mathrm{\Σ}}}\left\{\right[({\mathrm{\λ}}_{P.k.{k}_{1}}-{\mathrm{\λ}}_{P.k.{k}_{2}}){P}_{F.0.l}+({\mathrm{\λ}}_{Q.k.{k}_{1}}-{\mathrm{\λ}}_{Q.k.{k}_{2}}){Q}_{F.0.l}\left]{x}_{l}\right\}\\ +\underset{a=1}{\overset{A}{\mathrm{\Σ}}}\left({\mathrm{\λ}}_{Q.k.{k}_{3}}{Q}_{G.0.a}{y}_{a}\right)-\underset{b=1}{\overset{B}{\mathrm{\Σ}}}\left({\mathrm{\λ}}_{Q.k.{k}_{4}}{Q}_{H.0.b}{z}_{b}\right)\≤{v}_{s.k}-{v}_{c.k}k=\mathrm{1,2},\·\·\·,K\\ {x}_{r+1.d}=0,{x}_{r.d}=0r=\mathrm{1,2},\·\·\·,R-1\\ {x}_{r+1.d}=1,{x}_{r.d}=0|1r=\mathrm{1,2},\·\·\·,R-1\\ {x}_{l}=0|1l=\mathrm{1,2},\·\·\·,L\\ {y}_{a}=0|1a=\mathrm{1,2},\·\·\·,A\\ {z}_{b}=0|1b=\mathrm{1,2},\·\·\·,B\end{array}\right.---\left(7\right)$
Wherein, R is the priority number that bus load control measure concentrate excision load branch circuit, D
_{r}for bus load control measure concentrate priority be r can cutting load circuitry number, r is larger, and priority is higher, more preferentially excises, x
_{r.d}value is 0 or 1, equals 0 expression and does not excise this load, equals 1 expression and excises this load, work as x
_{r+1.d}when equaling 0, x
_{r.d}can only 0 be equaled, work as x
_{r+1.d}when equaling 1, x
_{r.d}can 0 be equaled, also can equal 1, P
_{e.r.0.d}, Q
_{e.r.0.d}be respectively t
_{0}moment priority be r can d load branch circuit meritorious and idle in cutting load branch road, C
_{r.0.d}for t
_{0}moment excision priority is the control cost of d load branch circuit in the load branch circuit of r, and K is that voltage decision-premaking control bus concentrates bus number,
to be respectively priority be r d load branch circuit connects in cutting load branch road voltage security stability monitoring equipment can concentrate kth
_{0}the injection of individual bus is gained merit and is concentrated the sensitivity of a kth busbar voltage to voltage decision-premaking control bus and inject idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage;
L is that concentrated can the turning of bus load control measure supplies load branch circuit number,
be respectively the individual confession load branch circuit that can turn of wherein l and concentrate kth at turn front the connected voltage security stability monitoring equipment of confession
_{1}the injection of individual bus is gained merit and is concentrated the sensitivity of a kth busbar voltage to voltage decision-premaking control bus and inject idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage,
be respectively the individual confession load branch circuit that can turn of wherein l and concentrate kth at turn rear the connected voltage security stability monitoring equipment of confession
_{2}the injection of individual bus is gained merit and is concentrated the sensitivity of a kth busbar voltage to voltage decision-premaking control bus and inject idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage, P
_{f.0.l}, Q
_{f.0.l}be respectively t
_{0}moment, wherein l was individual can turn the meritorious and idle of confession load branch circuit, x
_{l}value is 0 or 1, equals 0 expression and does not turn for this load branch circuit, equals 1 expression and turns for this load branch circuit;
A is that bus reactive-load compensation equipment control measure concentrate resectable shunt reactor circuitry number,
for the voltage security stability monitoring equipment that wherein a shunt reactor connects concentrates kth
_{3}the idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage of injection of individual bus, Q
_{g.0.a}for t
_{0}moment wherein a shunt reactor excision idle, y
_{a}value is 0 or 1, equals 0 expression and does not excise this shunt reactor branch road, equals 1 expression and excises this shunt reactor branch road;
B is that bus reactive-load compensation equipment control measure concentrate the shunt capacitor circuitry number that can drop into,
for the voltage security stability monitoring equipment that wherein b shunt capacitor connects concentrates kth
_{4}the idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage of injection of individual bus, Q
_{h.0.b}for t
_{0}moment wherein b shunt capacitor drop into after idle, the capacitive reactance adopting shunt capacitor to drop into and connected bus are at t
_{0}the voltage in moment calculates, z
_{b}value is 0 or 1, equals 0 expression and does not drop into this shunt capacitor branch road, equals 1 expression and drops into this shunt capacitor branch road;
V
_{s.k}, v
_{c.k}be respectively t
_{0}moment voltage decision-premaking control bus concentrates voltage security Critical Stability value and the emergency control enabling gate threshold value of a kth bus.
Beneficial effect of the present invention is as follows: the present invention proposes only based on the busbar voltage collected in real time and Branch Power Flow synchro measure data, do not rely on the operational mode of other plant stand of electric power system, do not rely on electric power system model and parameter, compared with carrying out the technology of emergency control with the precalculated control scheme list of employing, improve the reliability that voltage security stablizes emergency control.By setting up reflection busbar voltage variable quantity and each bus load is gained merit and tie-in equation between idle work variable quantity, according to each bus load gain merit and the idle sensitivity to busbar voltage change little characteristic at short notice, the equation group of incidence relation between multiple operating points of employing optimization method simultaneous solution reflection actual measurement running orbit, obtain each bus load to gain merit and the idle sensitivity to busbar voltage, consider priority and the cost of spatial load forecasting, in controlled reactive apparatus switching and spatial load forecasting measure space, search meets each busbar voltage safety and stability and requires and the reactive apparatus switching and the spatial load forecasting measure that control Least-cost, with compared with the technology measuring control on the spot, reduce the cost that voltage security stablizes emergency control, improve control precision.The present invention stablizes emergency control enabling gate threshold value according to the busbar voltage detected in real time lower than its voltage security, after passing through the adaptability check to decision-premaking control measure again, emergency control is implemented to electric power system, realizes the balance between reliability and real-time preferably.In a word, invention increases the combination property that voltage security stablizes the reliability of emergency control, real-time and precision, can realize preventing voltage from losing the coordination optimization emergency control of safety and stability.
Accompanying drawing explanation
Fig. 1 is the flow chart of step 1 to step 6 of the inventive method.
Fig. 2 is the flow chart of step 7 to step 8 of the inventive method.
Embodiment
With reference to the accompanying drawings and in conjunction with example, the present invention is described in further detail.
In Fig. 1, step 1 describes, and the voltage security stability monitoring equipment collected based on synchro measure concentrates voltage and the Branch Power Flow information of all buses, and by the samples storage cycle T of setting
_{0}store these information, obtain comprising up-to-date synchro measure moment t
_{0}information, in interior actual measurement historical information, enters step 2).The object of step 1) is for obtaining new synchro measure information, carrying out control decision calculating in order to following step.Wherein, T
_{0}0.02s can be set to.
In Fig. 1, step 2 describes, if the t collected
_{0}the voltage security stability monitoring equipment in moment is concentrated the voltage of all buses to be more than or equal to respective bus bars voltage-controlled calculating enabling gate threshold value all respectively or is wherein had at least the voltage of 1 bus to be less than or equal to the malfunction threshold value (usually can be set to 0.6p.u) of respective bus bars voltage, then return step 1); If the t collected
_{0}the voltage security stability monitoring equipment in moment concentrates the voltage of all buses be more than or equal to the emergency control enabling gate threshold value of respective bus bars voltage all respectively and wherein have at least the voltage of 1 bus to be less than respective bus bars voltage-controlled calculating enabling gate threshold value, then enter step 3); If the t collected
_{0}the voltage security stability monitoring equipment in moment concentrates the voltage of all buses be greater than the malfunction threshold value of respective bus bars voltage all respectively and wherein have at least the voltage of 1 bus to be less than the emergency control enabling gate threshold value of respective bus bars voltage, the bus then voltage being less than the emergency control enabling gate threshold value of respective bus bars voltage filters out, form voltage bus collection to be controlled, enter step 8).
The calculating enabling gate threshold value that described busbar voltage controls is greater than the emergency control enabling gate threshold value of respective bus bars voltage, the emergency control enabling gate threshold value of busbar voltage is greater than the safety and stability critical value of respective bus bars voltage, and the safety and stability critical value of busbar voltage is greater than the malfunction threshold value of respective bus bars voltage; The safety and stability critical value of each busbar voltage can be adjusted by off-line analysis, also can by adjusting in line computation.The calculating enabling gate threshold value that usual voltage security stability monitoring equipment concentrates i-th busbar voltage to control can be set to 1.09v
_{s.i}(wherein v
_{s.i}for voltage security stability monitoring equipment concentrates the safety and stability critical value of i-th busbar voltage), emergency control enabling gate threshold value can be set to 1.04v
_{s.i}, malfunction threshold value can be set to 0.5v
_{s.i}.
In Fig. 1, step 3 describes, if the sensitivity calculations sampling period T of the time span T corresponding to actual measurement historical information collected and setting
_{s}ratio be less than 4, then return step 1), otherwise, by t
_{0}moment as the 1st sampling instant point, with T
_{s}actual measurement historical information is sampled, makes the 2nd sampling instant point be t
_{0}-T
_{s}in the moment, the 3rd sampling instant point is t
_{0}-2T
_{s}in the moment, the 4th sampling instant point is t
_{0}-3T
_{s}in the moment, the 5th sampling instant point is t
_{0}-4T
_{s}in the moment, enter step 4).
Wherein, T
_{s}be set to the samples storage cycle T of surveying historical information
_{0}integral multiple, usually can by T
_{s}be set to 2T
_{0};
What in Fig. 1, step 4 described is, based on busbar voltage and the Branch Power Flow synchro measure information of adjacent two sampling instant points, set up the voltage variety of each bus between reflection two sampling instant points, load is gained merit variable quantity, load and the total idle work variable quantity of reactive-load compensation equipment and each bus inject the meritorious sensitivity to busbar voltage, inject the tie-in equation group that the idle sensitivity to busbar voltage and electrical network other factors cause the variable quantity of busbar voltage, each bus injected the meritorious sensitivity to busbar voltage and inject the idle sensitivity to busbar voltage, and at T
_{s}in interior electrical network, other factors causes the variable quantity of busbar voltage as variable, and hypothesis is in the tie-in equation group of different two neighbouring sample moment point, these variablees are identical, the tie-in equation group of relation between two the sampling instant point running statuses adopting optimization method simultaneous solution 4 reflection adjacent, if have optimal solution and be unique solution, then using the most new explanation of optimal solution as corresponding variable, and by t
_{0}moment is as the moment t associated by most new explanation
_{r}, enter step 5), otherwise, enter step 5).
Represent from the 1st sampling instant point respectively by equation group (1)-(4) in step 4), the gain merit total idle work variable quantity of variable quantity, load and reactive-load compensation equipment and each bus of the voltage variety of each bus between 2 adjacent sampling instant points, load injects the meritorious sensitivity to busbar voltage, injects the relation that the idle sensitivity to busbar voltage and electrical network other factors cause the variable quantity of busbar voltage, and meritorious, idle is just all to flow into bus:
$\begin{array}{c}{v}_{0.i}-{v}_{1.i}=\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{0.j}-{P}_{1.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{0.j}-{Q}_{1.j})]\\ +\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{0.j}-{Q}_{1.j})\right]+\mathrm{\Δ}{V}_{i}i=\mathrm{1,2},\·\·\·,n\end{array}---\left(1\right)$
$\begin{array}{c}{v}_{1.i}-{v}_{2.i}=\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{1.j}-{P}_{2.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{1.j}-{Q}_{2.j})]\\ +\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{1.j}-{Q}_{2.j})\right]+\mathrm{\Δ}{V}_{i}i=\mathrm{1,2},\·\·\·,n\end{array}---\left(2\right)$
$\begin{array}{c}{v}_{2.i}-{v}_{3.i}=\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{2.j}-{P}_{3.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{2.j}-{Q}_{3.j})]\\ +\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{2.j}-{Q}_{3.j})\right]+\mathrm{\Δ}{V}_{i}i=\mathrm{1,2},\·\·\·,n\end{array}---\left(3\right)$
$\begin{array}{c}{v}_{3.i}-{v}_{4.i}=\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{3.j}-{P}_{4.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{3.j}-{Q}_{4.j})]\\ +\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{3.j}-{Q}_{4.j})\right]+\mathrm{\Δ}{V}_{i}i=\mathrm{1,2},\·\·\·,n\end{array}---\left(4\right)$
Wherein, n is the number of the synchro measure information median generatrix of voltage, m is the number of the synchro measure information median generatrix of load, M is the number of idle synchro measure information median generatrix, before solving equation group (1)-(4), to need the bus bar of loads all in synchro measure information, above, there is no load, only have the bus bar of reactive-load compensation equipment later, v
_{0.i}, v
_{1.i}, v
_{2.i}, v
_{3.i}and v
_{4.i}be respectively the voltage that the 1st to the 5th sampling instant point voltage monitoring safety and stability equipment concentrates i-th bus, λ
_{p.i.j}, λ
_{q.i.j}being respectively voltage security stability monitoring equipment concentrates the injection of a jth bus gain merit to the sensitivity of i-th busbar voltage and inject the idle sensitivity to i-th busbar voltage, P
_{0.j}, P
_{1.j}, P
_{2.j}, P
_{3.j}and P
_{4.j}being respectively the 1st to the 5th sampling instant point voltage monitoring safety and stability equipment concentrates the total of load in a jth bus synchro measure information to gain merit, Q
_{0.j}, Q
_{1.j}, Q
_{2.j}, Q
_{3.j}and Q
_{4.j}be respectively the 1st to the 5th sampling instant point voltage monitoring safety and stability equipment and concentrate the always idle of load and reactive-load compensation equipment in a jth bus synchro measure information, Δ V
_{i}for other factors in electrical network causes voltage security stability monitoring equipment to concentrate the variable quantity of i-th busbar voltage.
λ is calculated by Optimization Method formula (5)
_{p.i.j}(wherein, i=1,2 ..., n; J=1,2 ..., m), λ
_{q.i.j}(wherein, i=1,2 ..., n; J=1,2 ..., M) and Δ V
_{i}(wherein, i=1,2 ..., n).
$\begin{array}{c}\mathrm{min}{\left\{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\right\{({v}_{0.i}-{v}_{1.i})-\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{0.j}-{P}_{1.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{0.j}-{Q}_{1.j})]-\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}\left[{\mathrm{\λ}}_{Q.i.j}({Q}_{0.j}-{Q}_{1.j})\right]-\mathrm{\Δ}{V}_{i}\}}^{2}\\ {+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\{({v}_{1.i}-{v}_{2.i})-\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{1.j}-{P}_{2.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{1.j}-{Q}_{2.j})]-\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{Q.i.j}({Q}_{1.j}-{Q}_{2.J})]-\mathrm{\Δ}{V}_{i}\}}^{2}\\ +\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\{({v}_{2.i}-{v}_{3.i})-\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{2.j}-{P}_{3.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{2.j}-{Q}_{3.j})]-\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{Q.i.j}({Q}_{2.j}-{Q}_{3.j})]-\mathrm{\Δ}{V}_{i}\}}^{2}\\ +\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\{({v}_{3.i}-{v}_{4.i})-\underset{j=1}{\overset{m}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{P.i.j}({P}_{3.j}-{P}_{4.j})+{\mathrm{\λ}}_{Q.i.j}({Q}_{3.j}-{Q}_{4.j})]-\underset{j=m+1}{\overset{M}{\mathrm{\Σ}}}[{\mathrm{\λ}}_{Q.i.j}({Q}_{3.j}-{Q}_{4.j})]-\mathrm{\Δ}{V}_{i}\}}^{2}\end{array}---\left(5\right).$
In Fig. 1, step 5 describes, if each bus injects the meritorious sensitivity to busbar voltage and injects the idle sensitivity to busbar voltage, and at T
_{s}in interior electrical network, other factors causes the solution of the variable quantity of busbar voltage to obtain and t
_{0}-t
_{r}be less than or equal to the sensitivity effective time (usually 0.3s can be set to) of setting, then the t will collected
_{0}the bus that in all buses in moment, voltage is less than the decision-premaking control gate threshold value of respective bus bars voltage filters out, form voltage decision-premaking control bus collection, for the situation of voltage decision-premaking control bus collection non-NULL, enter step 6), for the situation that voltage decision-premaking control bus collection is empty, return step 1); Otherwise, return step 1).
The decision-premaking control gate threshold value of described busbar voltage is greater than the emergency control enabling gate threshold value of respective bus bars voltage, and usual voltage security stability monitoring equipment concentrates the decision-premaking control gate threshold value of i-th busbar voltage to be set to 1.06v
_{s.i}(wherein v
_{s.i}for voltage security stability monitoring equipment concentrates the safety and stability critical value of i-th busbar voltage).
What in Fig. 1, step 6 described is, bus is injected the meritorious bus that setting is greater than to the sensitivity of busbar voltage and inject the meritorious sensitivity threshold value to busbar voltage and controlled bus load filters out, form bus load control measure collection, bus is injected bus that the idle sensitivity to busbar voltage is greater than setting to inject the idle sensitivity threshold value to busbar voltage and controlled bus load and filter out, join bus load control measure collection, bus is injected bus that the idle sensitivity to busbar voltage is greater than setting and inject the idle sensitivity threshold value to busbar voltage and resectable bus shunt reactor and the bus shunt capacitor that can drop into filters out, form bus reactive-load compensation equipment control measure collection, if bus load control measure collection non-NULL or bus reactive-load compensation equipment control measure collection non-NULL, enter step 7), otherwise, return step 1).
Described controlled bus load refers to the controlled load branch circuit being connected to this bus.
What in Fig. 1, step 7 described is, set up with the control Least-cost of cutting load as target function, consider the control priority of different cutting load measure, meritorious and idle in load transfer and cutting load measure is one, and load transfer, meeting voltage decision-premaking control bus after reactive-load compensation equipment is moved back in cutting load and throwing concentrates the increment of each busbar voltage to be more than or equal to 01 integer programming model of the constraints of the emergency control enabling gate threshold value of respective bus bars voltage and the difference of its voltage security Critical Stability value, the measure of calculating voltage safety and stability decision-premaking emergency control is carried out by solving 01 integer programming model, if can optimal solution be obtained, then by the load transfer measure corresponding to wherein arbitrary optimal solution, cutting load measure moves back reactive-load compensation equipment measure as up-to-date voltage security stability pre_decision emergency control measure with throwing, and by voltage decision-premaking control bus collection and t
_{0}moment is as the voltage decision-premaking control bus collection associated by up-to-date voltage security stability pre_decision emergency control measure and moment t
_{c}, return step 1), otherwise, return step 1).
In step 7), representing that target function, with the formula (7) represent 01 integer programming model of constraints by solving with the formula (6), carrying out the measure of calculating voltage safety and stability decision-premaking emergency control, meritorious, idle is just all to flow into bus:
$\mathrm{min}\left(\underset{r=1}{\overset{R}{\mathrm{\Σ}}}\underset{d=1}{\overset{{D}_{r}}{\mathrm{\Σ}}}(-{P}_{E.r.0.d}{C}_{r.0.d}{x}_{r.d})\right)---\left(6\right)$
$\left\{\begin{array}{c}\underset{r=1}{\overset{R}{\mathrm{\Σ}}}\underset{d=1}{\overset{{D}_{r}}{\mathrm{\Σ}}}\left[({\mathrm{\λ}}_{P.k.{k}_{0}}{P}_{E.r.0.d}+{\mathrm{\λ}}_{Q.k.{k}_{0}}{Q}_{E.r.0.d}){x}_{r.d}\right]\\ +\underset{l}{\overset{L}{\mathrm{\Σ}}}\left\{\right[({\mathrm{\λ}}_{P.k.{k}_{1}}-{\mathrm{\λ}}_{P.k.{k}_{2}}){P}_{F.0.l}+({\mathrm{\λ}}_{Q.k.{k}_{1}}-{\mathrm{\λ}}_{Q.k.{k}_{2}}){Q}_{F.0.l}\left]{x}_{l}\right\}\\ +\underset{a=1}{\overset{A}{\mathrm{\Σ}}}\left({\mathrm{\λ}}_{Q.k.{k}_{3}}{Q}_{G.0.a}{y}_{a}\right)-\underset{b=1}{\overset{B}{\mathrm{\Σ}}}\left({\mathrm{\λ}}_{Q.k.{k}_{4}}{Q}_{H.0.b}{z}_{b}\right)\≤{v}_{s.k}-{v}_{c.k}k=\mathrm{1,2},\·\·\·,K\\ {x}_{r+1.d}=0,{x}_{r.d}=0r=\mathrm{1,2},\·\·\·,R-1\\ {x}_{r+1.d}=1,{x}_{r.d}=0|1r=\mathrm{1,2},\·\·\·,R-1\\ {x}_{l}=0|1l=\mathrm{1,2},\·\·\·,L\\ {y}_{a}=0|1a=\mathrm{1,2},\·\·\·,A\\ {z}_{b}=0|1b=\mathrm{1,2},\·\·\·,B\end{array}\right.---\left(7\right)$
Wherein, R is the priority number that bus load control measure concentrate excision load branch circuit, D
_{r}for bus load control measure concentrate priority be r can cutting load circuitry number, r is larger, and priority is higher, more preferentially excises, x
_{r.d}value is 0 or 1, equals 0 expression and does not excise this load, equals 1 expression and excises this load, work as x
_{r+1.d}when equaling 0, x
_{r.d}can only 0 be equaled, work as x
_{r+1.d}when equaling 1, x
_{r.d}can 0 be equaled, also can equal 1, P
_{e.r.0.d}, Q
_{e.r.0.d}be respectively t
_{0}moment priority be r can d load branch circuit meritorious and idle in cutting load branch road, C
_{r.0.d}for t
_{0}moment excision priority is the control cost of d load branch circuit in the load branch circuit of r, and K is that voltage decision-premaking control bus concentrates bus number,
to be respectively priority be r d load branch circuit connects in cutting load branch road voltage security stability monitoring equipment can concentrate kth
_{0}the injection of individual bus is gained merit and is concentrated the sensitivity of a kth busbar voltage to voltage decision-premaking control bus and inject idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage;
L is that concentrated can the turning of bus load control measure supplies load branch circuit number,
be respectively the individual confession load branch circuit that can turn of wherein l and concentrate kth at turn front the connected voltage security stability monitoring equipment of confession
_{1}the injection of individual bus is gained merit and is concentrated the sensitivity of a kth busbar voltage to voltage decision-premaking control bus and inject idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage,
be respectively the individual confession load branch circuit that can turn of wherein l and concentrate kth at turn rear the connected voltage security stability monitoring equipment of confession
_{2}the injection of individual bus is gained merit and is concentrated the sensitivity of a kth busbar voltage to voltage decision-premaking control bus and inject idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage, P
_{f.0.l}, Q
_{f.0.l}be respectively t
_{0}moment, wherein l was individual can turn the meritorious and idle of confession load branch circuit, x
_{l}value is 0 or 1, equals 0 expression and does not turn for this load branch circuit, equals 1 expression and turns for this load branch circuit;
A is that bus reactive-load compensation equipment control measure concentrate resectable shunt reactor circuitry number,
for the voltage security stability monitoring equipment that wherein a shunt reactor connects concentrates kth
_{3}the idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage of injection of individual bus, Q
_{g.0.a}for t
_{0}moment wherein a shunt reactor excision idle, y
_{a}value is 0 or 1, equals 0 expression and does not excise this shunt reactor branch road, equals 1 expression and excises this shunt reactor branch road;
B is that bus reactive-load compensation equipment control measure concentrate the shunt capacitor circuitry number that can drop into,
for the voltage security stability monitoring equipment that wherein b shunt capacitor connects concentrates kth
_{4}the idle sensitivity of voltage decision-premaking control bus being concentrated to a kth busbar voltage of injection of individual bus, Q
_{h.0.b}for t
_{0}moment wherein b shunt capacitor drop into after idle, the capacitive reactance adopting shunt capacitor to drop into and connected bus are at t
_{0}the voltage in moment calculates, z
_{b}value is 0 or 1, equals 0 expression and does not drop into this shunt capacitor branch road, equals 1 expression and drops into this shunt capacitor branch road;
V
_{s.k}, v
_{c.k}be respectively t
_{0}moment voltage decision-premaking control bus concentrates voltage security Critical Stability value and the emergency control enabling gate threshold value of a kth bus.
In Fig. 1, step 8 describes, if up-to-date voltage security stability pre_decision emergency control measure has obtained and t
_{0}-t
_{c}be less than or equal to the effective time (usually 0.3s can be set to) of the decision-premaking emergency control measure of setting, then for the situation of the common factor non-NULL of the voltage decision-premaking control bus collection associated by up-to-date voltage security stability pre_decision emergency control measure and voltage bus collection to be controlled, up-to-date voltage security stability pre_decision emergency control measure is directly implemented, return step 1), common factor for the voltage decision-premaking control bus collection associated by up-to-date voltage security stability pre_decision emergency control measure and voltage bus collection to be controlled is the situation of empty set, returns step 1); Otherwise, return step 1).
Although the present invention with preferred embodiment openly as above, embodiment is not of the present invention for limiting.Without departing from the spirit and scope of the invention, any equivalence change done or retouching, belong to the protection range of the present invention equally.Therefore the content that protection scope of the present invention should define with the claim of the application is standard.