RENEWABLE ENERGY SITE REACTIVE POWER CONTROL
First Claim
1. A method for reactive power control for a renewable energy site that comprises one or more inverters, the method comprising:
- (a) determining a site-wide reactive power command comprised by a sum of a reactive power feedforward or compensation term and an integrator term; and
(b) distributing the site-wide reactive power command among inverters.
2 Assignments
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Accused Products
Abstract
Methods, systems, controller devices, and computer program products for reactive power control at a renewable energy site are provided. Embodiments address dynamic performance problems associated with control loop delay and the changing modes of operation for meeting utility voltage and reactive power constraints. Provided is a method for reactive power control involving: (a) determining a site-wide reactive power command comprised by a sum of a reactive power feedforward or compensation term and an integrator term; and (b) distributing the site-wide reactive power command among inverters. Embodiments can include a reactive power control term based on the sum of a single integrator and feed-forward compensation term, an integrator anti-windup mechanism based on the status of individual inverters, a means for decreasing detrimental effects of loop delay during reactive power reference changes, and/or a means of implementing voltage and power factor limits with smooth transfer between reactive power operating regions.
18 Citations
22 Claims
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1. A method for reactive power control for a renewable energy site that comprises one or more inverters, the method comprising:
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(a) determining a site-wide reactive power command comprised by a sum of a reactive power feedforward or compensation term and an integrator term; and (b) distributing the site-wide reactive power command among inverters. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for reactive power control for a renewable energy site that comprises one or more inverters, the method comprising:
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(1) providing data from a renewable energy site chosen from one or more of; (a) reactive power feedback (QFBK); (b) reactive power upper (Q_UL) and lower (Q_LL) limits; (c) a voltage reference (SiteVRef); (d) voltage feedback (VFBK); (e) voltage upper (V_UL) and lower (V_LL) limits; (f) a power factor reference (PFREF); and (g) a power feedback PFBK; and (2) calculating at least one source of error as; (a) a reactive power error (SiteQErr) based in part on QFBK and PFBK; (b) a gain-multiplied voltage threshold error based in part on VFBK, V_UL, and V_LL; (c) voltage error (SiteVErr) based in part on VFBK and Vref; (d) a gain-multiplied reactive power threshold error based in part on QFBK, Q_UL, and Q_LL; (3) selecting the source of error to be calculated based in part on choosing between a power factor control mode and a voltage control mode; (4) inputting the error into an integrator to provide an error integral (QINT); (5) calculating a feed-forward term (QCOMP) based in part on PFREF and PFBK; (6) adding QINT to QCOMP to yield a site-wide reactive power command (QCOM); (7) and distributing QCOM among one or more individual inverters. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A system of reactive power control for a renewable energy site comprising:
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one or more inverters; and a reactive power controller in operable communication with at least one of the one or more inverters and operably configured to generate a site-wide reactive power command (QCOM) by; (1) providing data from a renewable energy site chosen from one or more of; (a) reactive power feedback (QFBK); (b) reactive power upper (Q_UL) and lower (Q_μ
L) limits;(c) a voltage reference (SiteVRef); (d) voltage feedback (VFBK); (e) voltage upper (V_UL) and lower (V_LL) limits; (f) a power factor reference (PFREF); and (g) a power feedback PFBK; and (2) calculating at least one source of error as; (a) a reactive power error (SiteQErr) based in part on QFBK and PFBK; (b) a gain-multiplied voltage threshold error based in part on VFBK, V_UL, and V_LL; (c) voltage error (SiteVErr) based in part on VFBK and Vref; (d) a gain-multiplied reactive power threshold error based in part on QFBK, Q_UL, and Q_LL; (3) selecting the source of error to be calculated based in part on choosing between a power factor control mode and a voltage control mode; (4) inputting the error into an integrator to provide an error integral (QINT); (5) calculating a feed-forward term (QCOMP) based in part on PFREF and PFBK; and (6) adding QINT to QCOMP to yield a site-wide reactive power command (QCOM). - View Dependent Claims (21, 22)
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Specification