Voltage collapse diagnostic and ATC system
First Claim
1. A voltage collapse diagnosis method for an electrical power system including a transmission system and a distribution system, comprising:
- defining a plurality of buses and a plurality of sources of reactive reserves in the electrical power system as a plurality of agents;
identifying an exhaustion for each of the agents in response to applying at least one contingency to the electrical power system; and
creating a hierarchical organization arranged from those of the agents remote from the transmission system to others of the agents at the transmission system by defining the ones of the reactive reserves involved in the exhaustion for each of the agents and arranging each of the agents into a family line within the hierarchical organization wherein the respective agents in each respective family line are supported by at least one identical source of reactive reserves.
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Abstract
An analysis method for an electrical power system whereby the plurality of buses are grouped into agents, family lines of agents and families of agents based on the reactive reserves depleted when the buses are loaded. Contingencies are then applied to the electrical power system. The reactive reserves are monitored, and an exhaustion factor is determined for one or more family lines in one or more families. A boundary case solution is used to assess where, why, and how the contingency causes voltage instability, voltage collapse and/or local blackout. Based on this information, the design of voltage rescheduling, active rescheduling, unit commitment, load shedding, etc., is determined that can be used as preventive, corrective or emergency controls in applications such as system design and planning, operation planning, reactive and voltage management, real time control and Special Protection System Control. Based on this information, solutions can then be applied to the power system.
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Citations
43 Claims
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1. A voltage collapse diagnosis method for an electrical power system including a transmission system and a distribution system, comprising:
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defining a plurality of buses and a plurality of sources of reactive reserves in the electrical power system as a plurality of agents; identifying an exhaustion for each of the agents in response to applying at least one contingency to the electrical power system; and creating a hierarchical organization arranged from those of the agents remote from the transmission system to others of the agents at the transmission system by defining the ones of the reactive reserves involved in the exhaustion for each of the agents and arranging each of the agents into a family line within the hierarchical organization wherein the respective agents in each respective family line are supported by at least one identical source of reactive reserves. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A voltage collanse diagnosis method for an electrical power system, comprising:
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defining a plurality of buses and a plurality of reactive reserves in the electrical power system as a plurality of agents; and identifying an exhaustion for each of the agents in response to applying at least one contingency to the electrical power system wherein the agents are defined such that each subset of agents is supported by similar reactive reserves; and
wherein the identifying step comprises;applying a load to each of the plurality of buses; monitoring a power output from each of the plurality of reactive reserves in response to the load applied to each of the plurality of buses; identifying any of the plurality of reactive reserves that become about completely exhausted when a load flow algorithm calculated in conjunction with the applying step for each of the plurality of buses fails to solve; and defining the plurality of agents according to the plurality of buses and reactive reserves such that each agent contains buses that exhaust a same set of reactive reserves when a load flow algorithm fails to solve for the buses of the respective agent; wherein the same set of reactive reserves that exhaust for each agent are defined as a reactive reserve zone for each agent; and wherein a plurality of reactive reserve zones exists for the plurality of agents. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for determining criticality of a plurality of contingencies, comprising:
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applying a voltage collapse diagnosis to an electrical power system, wherein a plurality of contingencies are applied to the electrical power system and responses from a plurality of agents are monitored; and ranking the plurality of contingencies according to criticality wherein the step of ranking is performed according to; wherein Ci is a measure ranking of the contingency i; Pj is a total power generation or load associated with each of the agents j affected by contingency i; % outageremainingi is a fractional percentage of contingency i that is remaining at the time of the calculation; and % reactivereservesremainingij is the fractional percentage amount of reactive reserves remaining in each of the agents j affected by removal of the fractional percentage of contingency i.
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34. A method for determining criticality of a plurality of agents, comprising:
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applying a voltage collapse diagnosis to an electrical power system, wherein a plurality of contingencies are applied to the electrical power system and responses from a plurality of agents are monitored; and ranking the plurality of agents according to criticality wherein the step of ranking is performed according to; wherein Aj is a measure ranking of the agent j; Pj is a total power generation or load associated with each of the agents j affected by contingency i; % outageremainingi is a fractional percentage of contingency i that is remaining at the time of the calculation; and % reactivereservesremainingij is the fractional percentage amount of reactive reserves remaining in each of the agents j affected by removal of the fractional percentage of contingency i.
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35. A method for determining an available transfer capability, comprising:
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determining an amount of power that is available for transfer into a load pocket or control area wherein the determining step further comprises; performing a voltage collapse diagnosis; identifying contingencies wherein a corresponding load flow algorithm fails to solve; load shedding at the load pocket or control area until the corresponding load flow algorithm for each of the contingencies solves; and determining a remaining amount of reserves available for each of the contingencies before the corresponding load flow algorithm fails to solve. - View Dependent Claims (36, 37, 38)
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39. A method for determining an available transfer capability, comprising:
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determining an amount of power that is available for transfer into a load pocket or control area wherein the determining step further comprises; identifying combinations of single contingencies wherein a corresponding load flow algorithm fails to solve; performing load shedding at the load pocket or control area until the corresponding load flow algorithm for each of the combination of single contingencies solves; and determining a remaining amount of reserves available in the combinations of each single contingency before each corresponding load flow algorithm fails to solve. - View Dependent Claims (40, 41, 42, 43)
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Specification