System and method for Var injection at a distributed power generation source
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02J-003/00
H02J-003/18
출원번호
US-0285578
(2011-10-31)
등록번호
US-9112383
(2015-08-18)
발명자
/ 주소
Rojas, Hernan Alex
출원인 / 주소
General Electric Company
대리인 / 주소
Sutherland Asbill & Brennan LLP
인용정보
피인용 횟수 :
0인용 특허 :
16
초록▼
A method to add locally generated real and reactive power to a power distribution grid including: generating or storing direct current (DC) power by distributed power source; converting the DC power to an alternating current (AC) power; calculating or measuring a power factor of the AC power provide
A method to add locally generated real and reactive power to a power distribution grid including: generating or storing direct current (DC) power by distributed power source; converting the DC power to an alternating current (AC) power; calculating or measuring a power factor of the AC power provided from the distribution grid; determining a power factor for the conversion of DC power to AC power based on the power factor for the AC from the distribution grid, and the conversion of the DC power to the AC power sets the power factor for the AC power to conform to the determined power factor.
대표청구항▼
1. A method to add locally generated real or reactive power to a power distribution grid comprising: distributing, through the power distribution grid, alternating current (AC) power generated by a power generation plant to local sites connected to the power distribution grid;generating or storing d
1. A method to add locally generated real or reactive power to a power distribution grid comprising: distributing, through the power distribution grid, alternating current (AC) power generated by a power generation plant to local sites connected to the power distribution grid;generating or storing direct current (DC) power by a distributed power source at one of the local sites, wherein the distributed power source is connected to the power distribution grid;converting the DC power to AC power by executing pulse width modulation (PWM) of an inverter local to the distributed power source, wherein the inverter comprises insulated gate bipolar transistor (IGBT) switches configured to set a power factor, a frequency, and a phase of a voltage for the AC power converted by the inverter;sampling the AC power distributed by the power distribution grid at the local site of the distributed power source;calculating a power factor, a frequency, and a phase of a voltage for the AC power distributed by the power distribution grid based on sampling the AC power distributed by the power distribution grid at the local site of the distributed power source;comparing the power factor, the frequency, and the phase of the voltage for the AC power distributed by the power distribution grid to a desired power factor, a desired frequency, and a desired phase of a voltage for the AC power distributed by the power distribution grid at the local site of the distributed power source, wherein the desired power factor, the desired frequency, and the desired phase of a voltage for the AC power distributed by the power distribution grid are stored in a controller of the inverter;determining the power factor, the frequency, and the phase of the voltage for the conversion of DC power to AC power based on the power factor, the frequency, and the phase of the voltage for the AC power distributed by the power distribution grid;combining the AC power generated by the conversion with the AC power distributed by the power distribution grid; andwherein the conversion of the DC power to the AC power sets the power factor, the frequency, and the phase of the voltage for the AC power generated by the conversion to conform to the determined power factor, the determined frequency, and the determined phase of the voltage of the power distribution grid. 2. The method of claim 1 wherein the calculation or measurement of the power factor, the determination of the power factor and setting of the power factor are each performed periodically. 3. The method of claim 1 wherein the calculation of the power factor is stored as a schedule of power factors, and the determination of the power factor involves obtaining the power factor from the schedule. 4. The method of claim 1 wherein the calculation or measurement of the power factor involves data indicative of the power factor obtained from a meter monitoring the power grid proximate to a location where the DC power is generated or stored. 5. The method of claim 1 wherein the calculation or measurement of the power factor involves calculating or measuring the power factor at a central location associated with the power distribution grid. 6. The method of claim 5 wherein the calculation or measurement of the power factor includes obtaining data indicative of the power factor of AC power delivered from the power distribution grid to the location where the DC power is being generated. 7. A method using locally generated real and reactive power and power from a power utility to provide power to a customer load proximate to the locally generated real and reactive power, the method comprising: wherein the customer load consumes alternating current (AC) from the power utility and the customer load is distributed via a power distribution grid, wherein the utility power distribution grid distributes powers to customers of a power utility;generating or storing direct current (DC) power by a distributed power source at a customer location associated with the customer load, wherein the distributed power source is connected to the power distribution grid;converting the DC power to an alternating current (AC) power at the customer location by executing pulse width modulation (PWM) of an inverter local to the distributed power source, wherein the inverter comprises insulated gate bipolar transistor (IGBT) switches configured to set a power factor, a frequency, and a phase of a voltage for the AC power converted by the inverter, and applying the AC power converted from the DC power to power the customer load;sampling the AC power distributed by the power distribution grid at the customer location associated with the customer load;calculating a power factor, a frequency, and a phase of a voltage for the AC power from the power distribution grid and being provided to the customer location based on sampling the AC power distributed by the power distribution grid at the customer location associated with the customer load;comparing the power factor, the frequency, and the phase of the voltage for the AC power distributed by the power distribution grid to a desired power factor, a desired frequency, and a desired phase of a voltage for the AC power distributed by the power distribution grid at the local site of the distributed power source, wherein the desired power factor, the desired frequency, and the desired phase of a voltage for the AC power distributed by the power distribution grid are stored in a controller of the inverter;determining the power factor, the frequency, and the phase of the voltage for the conversion of DC power to AC power based on the power factor, the frequency, and the phase of the voltage for the AC power distributed by the power distribution grid; andwherein the conversion of the DC power to the AC power sets the power factor, the frequency, and the phase of the voltage for the AC power to match the determined power factor, the determined frequency, and the determined phase of the voltage of the power distribution grid. 8. The method of claim 7 wherein the calculation or measurement of the power factor, the determination of the power factor and setting of the power factor are each performed periodically. 9. The method of claim 7 wherein the calculation of the power factor is stored as a schedule of power factors, and the determination of the power factor involves obtaining the power factor from the schedule. 10. The method of claim 7 wherein the calculation or measurement of the power factor involves using data indicative of the power factor obtained from a AC power meter at the customer location. 11. The method of claim 7 wherein the calculation or measurement of the power factor involves calculating or measuring the power factor for the customer location from a remote location associated with the power distribution grid. 12. A distributed real and reactive power generation assembly comprising: a source of direct current (DC) power at a location of a customer of a power utility;an inverter electrically coupled to the source of DC power and to a utility AC power distribution grid distributing AC power to customers of the power utility, wherein the inverter converts the DC power to AC power to be applied to the distribution grid, wherein the inverter comprises insulated gate bipolar transistor (IGBT) switches configured to set a power factor, a frequency, and a phase of a voltage for the AC power converted by the inverter by executing pulse width modulation (PWM);a controller for the inverter, wherein the controller receives data indicative of a desired power factor for the AC power to be converted from the DC power or data indicative of a power factor of the AC power being distributed on the distribution grid by sampling the AC power distributed by the power distribution grid at the location of the customer, wherein the controller is configured to: calculate a power factor, a frequency, and a phase of a voltage for the AC power distributed by the utility AC power distribution grid based on sampling the AC power distributed by the utility AC power distribution grid at the location of the customer;compare the power factor, the frequency, and the phase of the voltage for the AC power distributed by the utility AC power distribution grid to a desired power factor, a desired frequency, and a desired phase of a voltage for the AC power distributed by the utility AC power distribution grid at the location of the customer, wherein the desired power factor, the desired frequency, and the desired phase of a voltage for the AC power distributed by the utility AC power distribution grid are stored in a controller of the inverter; anddetermine the power factor, the frequency, and the phase of the voltage for the conversion of DC power to AC power based on the power factor, the frequency, and the phase of the voltage for the AC power distributed by the power distribution grid; andwherein the controller applies the data to set a power factor, the frequency, and the phase of the voltage for the AC power to be converted and applied to the distribution grid to conform to the determined power factor, the determined frequency, and the determined phase of the voltage of the utility AC power distribution grid. 13. The distributed real and reactive power generation assembly as in claim 12 wherein the controller periodically sets the power factor based on the data which is periodically received. 14. The distributed real and reactive power generation assembly as in claim 12 wherein the controllers stores a schedule of power factors, and the controller uses the schedule to determine the power factor to be set in the AC power converted from the DC power. 15. The distributed real and reactive power generation assembly as in claim 12 wherein the received data is indicative of a measurement from a meter at a customer location proximate to the distributed power generation assembly. 16. The distributed real and reactive power generation assembly as in claim 12 wherein the received data is received from a remote location associated with the power distribution grid.
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이 특허에 인용된 특허 (16)
Kulesa Joseph C. (West Chester OH) Crawford ; Jr. David E. (Cincinnati OH), Apparatus for retaining rotor blades.
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